Hello Maxime,
In the spirit of assisting you, here are a few vectors to resolve your
issue:
Issue: "unable to find valid certification path to requested target
at com.sun.mail.smtp.SMTPTransport.startTLS"
Suggestions:
1. OM configuration issue:
Configure Admin -> Configuration
Smtp_server: this is the smtp server to send messages.
Smtp_port: this is the smtp server port normally 25 or 80, if using no SSL,
otherwise 443 if using SSL encrypted e-mail.
System_email_addr: all sent e-mails by the system including invitations
will have this address:
Email_username (System authentication email username): your e-mail's
username: .... or on how your third party e-mail client is configured.
Email_userpass: the password of your e-mail's username
Mail.smtp.starttls.enable: 0 (if above 25 or 80) or 1 (if above is 443)
Enable TLS 1=true, 0=false
For example, in GMail,
Smtp_server: smtp.gmail.com
Smtp_port: Port 465 (SSL required)
Port 587 (TLS required)
2. Additional: Firewall
Open OS and software firewall SMTP ports.
Set hardware firewall policies NAT allow from your server to WAN.
Thank you.
Sincerely,
Hemant K. Sabat
Coscend Communications Solutions
www.Coscend.com
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-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, July 12, 2017 12:29 PM
To: [email protected]
Subject: help configuration smtp server
Hello,
We are installing a version of openmeetings (last stable) on a stretch
Debian. Everything seems to work fine but we configured a smtp server with
starttls port 587 from a functional mail server and we have a mail sending
problem after creating a conference in the calendar.
The "email Management" shows multiple errors as follows :
Last Error
javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
javax.net.ssl.SSLHandshakeException:
sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find
valid certification path to requested target
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2064)
at
com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:724)
at javax.mail.Service.connect(Service.java:388)
at javax.mail.Service.connect(Service.java:246)
at javax.mail.Service.connect(Service.java:195)
at javax.mail.Transport.send0(Transport.java:254)
at javax.mail.Transport.send(Transport.java:124)
at
org.apache.openmeetings.core.mail.MailHandler$2.run(MailHandler.java:242)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:11
42)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:6
17)
at java.lang.Thread.run(Thread.java:748)
Caused by: javax.net.ssl.SSLHandshakeException:
sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find
valid certification path to requested target
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
at
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:15
14)
at
sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1026)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:961)
at
sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
at
sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:13
75)
at
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
at
sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
at
com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:598)
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:525)
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2059)
... 10 more
Caused by: sun.security.validator.ValidatorException: PKIX path building
failed: sun.security.provider.certpath.SunCertPathBuilderException:
unable to find valid certification path to requested target
at
sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
at
sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
at sun.security.validator.Validator.validate(Validator.java:260)
at
sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324
)
at
sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java
:229)
at
sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImp
l.java:124)
at
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:14
96)
... 20 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException:
unable to find valid certification path to requested target
at
sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.j
ava:141)
at
sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBui
lder.java:126)
at
java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at
sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
... 26 more
Could you help us on configuring mail server with openmeetings ?
Thanks for your help.
Best Regards.
Maxime
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