I installed a 19.8.0 and still have the same error
go-agent.log
2022-05-02 13:22:22,498 ERROR [scheduler-3] AgentHTTPClientController:103 - 
Error occurred when agent tried to ping server: 
org.springframework.remoting.RemoteAccessException: Could not access HTTP 
invoker remote service at 
[https://go.dev.scitorque.com:8154/go/remoting/remoteBuildRepository]; 
nested exception is javax.net.ssl.SSLException: readHandshakeRecord
    at 
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.convertHttpInvokerAccessException(HttpInvokerClientInterceptor.java:226)
    at 
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:153)
    at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at 
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    at com.sun.proxy.$Proxy10.ping(Unknown Source)
    at 
com.thoughtworks.go.agent.AgentHTTPClientController.ping(AgentHTTPClientController.java:98)
    at jdk.internal.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
    at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown 
Source)
    at java.base/java.lang.reflect.Method.invoke(Unknown Source)
    at 
org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
    at 
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
    at 
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown 
Source)
    at java.base/java.util.concurrent.FutureTask.runAndReset(Unknown Source)
    at 
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown
 
Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source)
    at java.base/java.lang.Thread.run(Unknown Source)
Caused by: javax.net.ssl.SSLException: readHandshakeRecord
    at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(Unknown 
Source)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(Unknown 
Source)
    at 
org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
    at 
org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
    at 
org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
    at 
org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
    at 
org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394)
    at 
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
    at 
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
    at 
org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
    at 
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
    at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
    at 
com.thoughtworks.go.agent.common.ssl.GoAgentServerHttpClient.execute(GoAgentServerHttpClient.java:54)
    at 
com.thoughtworks.go.agent.GoHttpClientHttpInvokerRequestExecutor.doExecuteRequest(GoHttpClientHttpInvokerRequestExecutor.java:78)
    at 
org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.executeRequest(AbstractHttpInvokerRequestExecutor.java:137)
    at 
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:202)
    at 
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:184)
    at 
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:150)
    ... 15 common frames omitted
    Suppressed: java.net.SocketException: Software caused connection abort: 
socket write error
        at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
        at java.base/java.net.SocketOutputStream.socketWrite(Unknown Source)
        at java.base/java.net.SocketOutputStream.write(Unknown Source)
        at 
java.base/sun.security.ssl.SSLSocketOutputRecord.encodeAlert(Unknown Source)
        at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)
        at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)
        ... 33 common frames omitted
Caused by: java.net.SocketException: Software caused connection abort:

go-agent-bootstrapper.log

2022-05-02 11:25:27,324 INFO  [WrapperJarAppMain] 
DefaultAgentLauncherCreatorImpl:66 - Attempting to load 
com.thoughtworks.go.agent.launcher.AgentLauncherImpl as specified by 
manifest key Go-Agent-Launcher-Class
2022-05-02 11:25:27,339 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLauncher using 
java.net.URLClassLoader
2022-05-02 11:25:27,402 INFO  [WrapperJarAppMain] AgentBootstrapper:76 - 
Attempting create and start launcher...
2022-05-02 11:25:27,402 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLaunchDescriptor using 
java.net.URLClassLoader
2022-05-02 11:29:21,512 INFO  [WrapperJarAppMain] 
DefaultAgentLauncherCreatorImpl:66 - Attempting to load 
com.thoughtworks.go.agent.launcher.AgentLauncherImpl as specified by 
manifest key Go-Agent-Launcher-Class
2022-05-02 11:29:21,528 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLauncher using 
java.net.URLClassLoader
2022-05-02 11:29:21,590 INFO  [WrapperJarAppMain] AgentBootstrapper:76 - 
Attempting create and start launcher...
2022-05-02 11:29:21,590 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLaunchDescriptor using 
java.net.URLClassLoader
2022-05-02 12:46:33,427 INFO  [WrapperJarAppMain] 
DefaultAgentLauncherCreatorImpl:66 - Attempting to load 
com.thoughtworks.go.agent.launcher.AgentLauncherImpl as specified by 
manifest key Go-Agent-Launcher-Class
2022-05-02 12:46:33,442 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLauncher using 
java.net.URLClassLoader
2022-05-02 12:46:33,489 INFO  [WrapperJarAppMain] AgentBootstrapper:76 - 
Attempting create and start launcher...
2022-05-02 12:46:33,505 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLaunchDescriptor using 
java.net.URLClassLoader
2022-05-02 12:46:41,543 INFO  [WrapperJarAppMain] 
DefaultAgentLauncherCreatorImpl:66 - Attempting to load 
com.thoughtworks.go.agent.launcher.AgentLauncherImpl as specified by 
manifest key Go-Agent-Launcher-Class
2022-05-02 12:46:41,559 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLauncher using 
java.net.URLClassLoader
2022-05-02 12:46:41,606 INFO  [WrapperJarAppMain] AgentBootstrapper:76 - 
Attempting create and start launcher...
2022-05-02 12:46:41,622 INFO  [WrapperJarAppMain] 
ParentClassAccessFilteringClassloader:43 - Loading 
com.thoughtworks.cruise.agent.common.launcher.AgentLaunchDescriptor using 
java.net.URLClassLoader


go-agent-launcher.log
 11:29:21,746 INFO  [TouchLoopThread-1] Lockfile:101 - Using lock file: 
E:\GoCD\.agent-bootstrapper.running
2022-05-02 11:29:22,621 INFO  [WrapperJarAppMain] AgentProcessParentImpl:51 
- Agent is version: 19.8.0-9915
2022-05-02 11:29:22,887 INFO  [WrapperJarAppMain] AgentProcessParentImpl:70 
- Launching Agent with command: E:\GoCD\jre\bin\java -Xms128m -Xmx256m 
-Dagent.plugins.md5=afaec24e880c980e4d69468b3935a0c9 
-Dagent.binary.md5=719e377e29d813420722282789c12dc9 
-Dagent.launcher.md5=59699f411657bd44394eeb5c80819be8 
-Dagent.tfs.md5=a101373f5e2ef88f52b45d836589d94a -jar agent.jar -serverUrl 
https://go.dev.scitorque.com:8154/go -sslVerificationMode NONE
2022-05-02 12:46:30,675 INFO  [ShutdownThread-5] 
AgentProcessParentImpl$Shutdown:185 - Shutdown hook invoked. Shutting down 
Process[pid=1820, exitValue="not exited"]
2022-05-02 12:46:33,614 INFO  [TouchLoopThread-1] Lockfile:101 - Using lock 
file: E:\GoCD\.agent-bootstrapper.running
2022-05-02 12:46:34,536 INFO  [WrapperJarAppMain] AgentProcessParentImpl:51 
- Agent is version: 19.8.0-9915
2022-05-02 12:46:34,817 INFO  [WrapperJarAppMain] AgentProcessParentImpl:70 
- Launching Agent with command: E:\GoCD\jre\bin\java -Xms128m -Xmx256m 
-Dagent.plugins.md5=afaec24e880c980e4d69468b3935a0c9 
-Dagent.binary.md5=719e377e29d813420722282789c12dc9 
-Dagent.launcher.md5=59699f411657bd44394eeb5c80819be8 
-Dagent.tfs.md5=a101373f5e2ef88f52b45d836589d94a -jar agent.jar -serverUrl 
https://go.dev.scitorque.com:8154/go -sslVerificationMode NONE
2022-05-02 12:46:39,099 INFO  [ShutdownThread-5] 
AgentProcessParentImpl$Shutdown:185 - Shutdown hook invoked. Shutting down 
Process[pid=6112, exitValue="not exited"]
2022-05-02 12:46:41,731 INFO  [TouchLoopThread-1] Lockfile:101 - Using lock 
file: E:\GoCD\.agent-bootstrapper.running
2022-05-02 12:46:42,653 INFO  [WrapperJarAppMain] AgentProcessParentImpl:51 
- Agent is version: 19.8.0-9915
2022-05-02 12:46:42,981 INFO  [WrapperJarAppMain] AgentProcessParentImpl:70 
- Launching Agent with command: E:\GoCD\jre\bin\java -Xms128m -Xmx256m 
-Dagent.plugins.md5=afaec24e880c980e4d69468b3935a0c9 
-Dagent.binary.md5=719e377e29d813420722282789c12dc9 
-Dagent.launcher.md5=59699f411657bd44394eeb5c80819be8 
-Dagent.tfs.md5=a101373f5e2ef88f52b45d836589d94a -jar agent.jar -serverUrl 
https://go.dev.scitorque.com:8154/go -sslVerificationMode NONE
On Monday, 2 May 2022 at 10:53:46 UTC-4 Obiageli Adegbite wrote:

> Hi Sriram,
>  I have tried your 3 suggested steps and it is still loosing contact I 
> will uninstall and try install a different version and see how that goes
>
>
> On Monday, 2 May 2022 at 05:50:57 UTC-4 [email protected] wrote:
>
>> Replying here since I am unable to see the original mail in my mailbox:
>>
>> If you have renamed the agent.jks file and are able to re-establish 
>> contact (you've said the agent is idle for 10-15 minutes), then please try 
>> the following:
>> 1. Disable the agent and then enable it again.
>> 2. If removing it and adding it back is an option, then please do so
>> 3. Uninstall the agent and then reinstall it.
>>
>> I have had to do (2) and (3) above when the agent bootstrapper was so far 
>> outdated from the server that just the built-in agent auto-update was not 
>> enough.
>>
>> Separately, did you update your Java installation? That once led me to 
>> have to delete the agent.jks like you have had to.
>>
>>
>> -- Sriram
>>
>> On Mon, May 2, 2022 at 4:41 PM Chad Wilson <[email protected]> 
>> wrote:
>>
>>> Hello
>>>
>>> This seems like an old GoCD version that you are running - are you able 
>>> to report what version your server and agents are?
>>>
>>> It might be a bit difficult to provide great suggestions for these older 
>>> versions, since the in-built TLS support for GoCD was replaced in GoCD 
>>> 20.2.0 <https://github.com/gocd/gocd/issues/7872> and the 
>>> communications mechanism between server and agent was changed in GoCD 
>>> 21.1.0 meaning it's a bit tough to recall all the details here.
>>>
>>> I have a few questions though:
>>>
>>>    - Did something change in your setup (agent or servers) after which 
>>>    this started happening? 
>>>    - Are all agents having problems or only a subset of agents?
>>>    - What do the server logs say at the same time as the agent has 
>>>    these errors?
>>>    
>>> I am completely guessing, since I am not familiar with GoCD's old 
>>> TLS/mTLS setup, but this might mean certificates have expired somewhere and 
>>> your agent has somehow lost trust in the server (or vice versa - the server 
>>> no longer trusts the agent). To know why that is would require a bit more 
>>> digging though.
>>>
>>> -Chad
>>>
>>>
>>> On Sat, Apr 30, 2022 at 3:13 AM Obiageli Adegbite <[email protected]> 
>>> wrote:
>>>
>>>> My Window 2019 Agent Keeps loosing contact, due to SSL Handshake 
>>>> errors, when I delete/rename the agent.jks file  it goes to idle and after 
>>>> 10 -15 minutes returns to lost contact what can i do?
>>>>
>>>> Error Message
>>>> 04-29 14:20:46,308 ERROR [scheduler-2] AgentHTTPClientController:103 - 
>>>> Error occurred when agent tried to ping server: 
>>>> org.springframework.remoting.RemoteAccessException: Could not access 
>>>> HTTP invoker remote service at [
>>>> https://go.dev.scitorque.com:8154/go/remoting/remoteBuildRepository]; 
>>>> nested exception is javax.net.ssl.SSLHandshakeException: Received fatal 
>>>> alert: certificate_unknown
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.convertHttpInvokerAccessException(HttpInvokerClientInterceptor.java:226)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:153)
>>>>     at 
>>>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
>>>>     at 
>>>> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
>>>>     at com.sun.proxy.$Proxy8.ping(Unknown Source)
>>>>     at 
>>>> com.thoughtworks.go.agent.AgentHTTPClientController.ping(AgentHTTPClientController.java:98)
>>>>     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>>>>     at 
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>     at java.lang.reflect.Method.invoke(Method.java:498)
>>>>     at 
>>>> org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
>>>>     at 
>>>> org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
>>>>     at 
>>>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>>>>     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>>     at java.lang.Thread.run(Thread.java:745)
>>>> Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: 
>>>> certificate_unknown
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)
>>>>     at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2023)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1125)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
>>>>     at 
>>>> org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
>>>>     at 
>>>> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
>>>>     at 
>>>> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
>>>>     at 
>>>> org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
>>>>     at 
>>>> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
>>>>     at 
>>>> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
>>>>     at 
>>>> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
>>>>     at 
>>>> com.thoughtworks.go.agent.common.ssl.GoAgentServerHttpClient.execute(GoAgentServerHttpClient.java:54)
>>>>     at 
>>>> com.thoughtworks.go.agent.GoHttpClientHttpInvokerRequestExecutor.doExecuteRequest(GoHttpClientHttpInvokerRequestExecutor.java:78)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.executeRequest(AbstractHttpInvokerRequestExecutor.java:137)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:202)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:184)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:150)
>>>>     ... 16 common frames omitted
>>>> 2022-04-29 14:20:48,718 ERROR [scheduler-1] AgentUpgradeService:92 - 
>>>> [Agent Upgrade] Couldn't connect to: 
>>>> https://go.dev.scitorque.com:8154/go/admin/latest-agent.status: 
>>>> javax.net.ssl.SSLHandshakeException: Received fatal alert: 
>>>> certificate_unknown
>>>> 2022-04-29 14:20:48,718 ERROR [scheduler-1] AgentController:91 - [Agent 
>>>> Loop] Error occurred during loop: 
>>>> javax.net.ssl.SSLHandshakeException: Received fatal alert: 
>>>> certificate_unknown
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)
>>>>     at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2023)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1125)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
>>>>     at 
>>>> org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
>>>>     at 
>>>> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
>>>>     at 
>>>> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
>>>>     at 
>>>> org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
>>>>     at 
>>>> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
>>>>     at 
>>>> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
>>>>     at 
>>>> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
>>>>     at 
>>>> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
>>>>     at 
>>>> com.thoughtworks.go.agent.common.ssl.GoAgentServerHttpClient.execute(GoAgentServerHttpClient.java:49)
>>>>     at 
>>>> com.thoughtworks.go.agent.service.AgentUpgradeService.checkForUpgradeAndExtraProperties(AgentUpgradeService.java:80)
>>>>     at 
>>>> com.thoughtworks.go.agent.service.AgentUpgradeService.checkForUpgradeAndExtraProperties(AgentUpgradeService.java:73)
>>>>     at 
>>>> com.thoughtworks.go.agent.AgentController.loop(AgentController.java:83)
>>>>     at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
>>>>     at 
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>     at java.lang.reflect.Method.invoke(Method.java:498)
>>>>     at 
>>>> org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
>>>>     at 
>>>> org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
>>>>     at 
>>>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>>>>     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>>     at java.lang.Thread.run(Thread.java:745)
>>>> 2022-04-29 14:20:51,393 ERROR [scheduler-3] 
>>>> AgentHTTPClientController:103 - Error occurred when agent tried to ping 
>>>> server: 
>>>> org.springframework.remoting.RemoteAccessException: Could not access 
>>>> HTTP invoker remote service at [
>>>> https://go.dev.scitorque.com:8154/go/remoting/remoteBuildRepository]; 
>>>> nested exception is javax.net.ssl.SSLHandshakeException: Received fatal 
>>>> alert: certificate_unknown
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.convertHttpInvokerAccessException(HttpInvokerClientInterceptor.java:226)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:153)
>>>>     at 
>>>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
>>>>     at 
>>>> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
>>>>     at com.sun.proxy.$Proxy8.ping(Unknown Source)
>>>>     at 
>>>> com.thoughtworks.go.agent.AgentHTTPClientController.ping(AgentHTTPClientController.java:98)
>>>>     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>>>>     at 
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>     at java.lang.reflect.Method.invoke(Method.java:498)
>>>>     at 
>>>> org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
>>>>     at 
>>>> org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
>>>>     at 
>>>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>>>>     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>>>>     at 
>>>> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>>>>     at 
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>>     at java.lang.Thread.run(Thread.java:745)
>>>> Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: 
>>>> certificate_unknown
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
>>>>     at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)
>>>>     at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2023)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1125)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
>>>>     at 
>>>> sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:396)
>>>>     at 
>>>> org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:355)
>>>>     at 
>>>> org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
>>>>     at 
>>>> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:394)
>>>>     at 
>>>> org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
>>>>     at 
>>>> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
>>>>     at 
>>>> org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
>>>>     at 
>>>> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
>>>>     at 
>>>> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
>>>>     at 
>>>> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
>>>>     at 
>>>> com.thoughtworks.go.agent.common.ssl.GoAgentServerHttpClient.execute(GoAgentServerHttpClient.java:54)
>>>>     at 
>>>> com.thoughtworks.go.agent.GoHttpClientHttpInvokerRequestExecutor.doExecuteRequest(GoHttpClientHttpInvokerRequestExecutor.java:78)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.executeRequest(AbstractHttpInvokerRequestExecutor.java:137)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:202)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:184)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:150)
>>>>     ... 16 common frames omitted
>>>> 2022-04-29 14:20:56,476 ERROR [scheduler-1] 
>>>> AgentHTTPClientController:103 - Error occurred when agent tried to ping 
>>>> server: 
>>>> org.springframework.remoting.RemoteAccessException: Could not access 
>>>> HTTP invoker remote service at [
>>>> https://go.dev.scitorque.com:8154/go/remoting/remoteBuildRepository]; 
>>>> nested exception is javax.net.ssl.SSLHandshakeException: Received fatal 
>>>> alert: certificate_unknown
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.convertHttpInvokerAccessException(HttpInvokerClientInterceptor.java:226)
>>>>     at 
>>>> org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:153)
>>>>     at 
>>>> org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
>>>>     at 
>>>> org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
>>>>     at com.sun.proxy.$Proxy8.ping(Unknown Source)
>>>>     at 
>>>> com.thoughtworks.go.agent.AgentHTTPClientController.ping(AgentHTTPClientController.java:98)
>>>>     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
>>>>     at 
>>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>     at java.lang.reflect.Method.invoke(Method.java:498)
>>>>     at 
>>>> org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
>>>>     at 
>>>> org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
>>>>     at 
>>>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>>>>     at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>>>>
>>>> kindly help
>>>>
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>>>> .
>>>>
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