Certificate Validation Failed

With some servers, you may see an error that looks like this (debug log enabled):

[21:57:55] TLS: certificate validation failed at depth 2: unable to get local issuer certificate                                                                                                                                              
[21:57:55] TLS: alert during write: fatal (unknown CA).                                                                                                                                                                                       
[21:57:55] TLS: awaiting more writes                                                                                                                                                                                                          
[21:57:55] TLS: handshake failed due to the following error: certificate verify failed                                                                                                                                                        
[21:57:55] TLS: handshake failed due to the following errors:                                                                                                                                                                                 
[21:57:55] TLS: error:0A000086:SSL routines::certificate verify failed    

The exact cause or server misconfiguration is still unknown, but if you see this error, ensure you have set your local CA path in the config correctly:

set ssl-capath /etc/ssl/certs