- Platform information:
- OS: Windows 10
- Java Runtime Environment: Zulu11 (11.50.19 JDK 11.0.12)
- openHAB version:3.3.0.M1 Milestone
I am facing the issue that mailActions (sendmail) is not working. In TRACE logs the following error appears:
2022-02-17 13:40:12.040 [WARN ] [ab.binding.mail.internal.SMTPHandler] - Sending the email to the following server failed : smtp.gmail.com:465 2022-02-17 13:40:12.041 [WARN ] [ab.binding.mail.internal.SMTPHandler] - javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465; nested exception is: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
It seems there is a certificate issue - whatever this means. I found some older threads in the community with respect to other bindings (CalDAV, …), so I guess it is not related to the binding itself.
I also found some blogs which describe how to copy the gmail certificate in openSSL console in Java keystore - at least this is what I understand (e.g. here) for Windows.
Based on this blog there should be some random letters which is the certificate, but actually there is nothing like that when I am executing the command. Please find what is shown for me:
C:\Users\wosch2>openssl s_client -connect smtp.gmail.com:465 CONNECTED(000001B0) write:errno=10054 --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 316 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) ---
To be honest, I have absolutely no idea what all this stuff is… That’s why I am lost, even when some of old threads have been solved (e.g. here). Additionally, Windows is quite rarely used compared to Linux…
P.S.: I tried to keep this post as short as possible, that’s why I reduced the general hardware/software information and did not copy my Thing’s config and rules. If any information is required, please let me know!
Hopefully there is anybody which could help me as a beginner through the next steps. Thank you!