Linux - Traceert, ip look up, SSL Cert Command, common name, No subject alternative names present

LookUp server IP

nslookup serverName

Check if IP is reachable

tracert IP_ADDR

SSL show sever certificate

openssl s_client -connect serverName:443 -showcerts

Certificate common name

The Common Name (AKA CN) represents the server name protected by the SSL certificate.

https://support.dnsimple.com/articles/what-is-common-name/#:~:text=The%20Common%20Name%20(AKA%20CN,protected%20by%20the%20SSL%20certificate.&text=In%20the%20case%20of%20a,example.com%20).

Certificate No subject alternative names present

No subject alternative names present is caused when accessing an application over HTTPS by using the IP address on the URL rather than the domain contained in the remote SSL certificate and the SSL certificate being fetched does not contain the Subject Alternative Name (SAN) parameter with the matching IP address as an alternative attribute. Java is very strict about enforcing that the certificate contains a SAN entry for the IP address, if that is how it's being

Li

https://confluence.atlassian.com/stashkb/no-subject-alternative-names-693896719.html#:~:text=No%20subject%20alternative%20names%20present%20is%20caused%20when%20accessing%20an,matching%20IP%20address%20as%20an