SSL connection fails with "x509 certificate is not valid for any names, but wanted to match"

This document (000020714) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15

SUSE Linux Enterprise Server 12

Situation

While in the past it was sufficient to have the server name as "Common Name(CN)" within the "Subject" of a certificate and additionally within "Subject Alternative Name", newer implementations may just check for "Subject Alternative Name".

Resolution

Recreate server certificate with "Subject Alternative Name" having DNS entry for the server name, for example:

openssl s_client -connect scc.suse.com:443 -showcerts 2>&1| openssl x509 -in - -noout -text|grep -A1 "Subject Alternative Name"            
...
       X509v3 Subject Alternative Name
               DNS:*.suse.com, DNS:suse.com

Cause

Newer implementations, for example, SUSEConnect within the package "suseconnect-ng", simply check for "Subject Alternative Name" within the certificate.

Additional Information

TID to recreate server certificate with "Subject Alternative Name" set for SMT:

https://www.suse.com/support/kb/doc/?id=000017336

Disclaimer

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