Hi Chad,
Yes I was using an older version 18.11, I'll install a newer and see if it 
corrects the error

On Monday, 2 May 2022 at 04:41:30 UTC-4 Chad Wilson 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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