I have configured SSL/TLS on Db2/Linux v126.96.36.199. In DBeaver 22.1.5 (Java GUI program to access database) in Driver properties I have configured parameter:
true and DBeaver successfully connects to Db2 user using SSL/TLS.
According to Db2 Java Driver documentation in DBeaver at Driver properties I have configured
BASIC to enable Db2 client to execute hostname validation.
When I double click to establish connection in DBeaver I get error:
[jcc][t4][4.31.10] Connection failed: could not establish a SSL connection with the server. The connection has been configured to use hostname validation and the servers TLS certificate does not contain a hostname or IP address which matches the value configured by the client. ERRORCODE=-20576, SQLSTATE=08001
To troubleshoot the problem, in DBeaver I enabled Connection calls trace and the output is:
[jcc][Time:2022-09-01-13:32:11.588][Thread:Connect to 'test1ssl_hostname_validation'][Connection@1fcbbce6]doHostnameValidation () called [jcc][Time:2022-09-01-13:32:11.588][Thread:Connect to 'test1ssl_hostname_validation'][Connection@1fcbbce6]doHostnameValidation () returned sslIsHostnameValid=false
It does not tell anything about what was the hostname it checked.
I have read Db2 documentation Troubleshooting hostname validation at the client when negotiating a TLS connection and according to documentation error should be logged into db2diag.log at Db2 server site. But there is no error at all recorded in my case.
I have even increased DIAGLEVEL dbm cfg parameter to maximum 4 and restarted the instance, reproduced the problem, but still no error is displayed in db2diag.log
For certificate I have double check Subject Alternative Name and there is correctly set FQDN.
How can I verify which hostname did client recognized and which hostname did it get from certificate? Regards