List remote refs failed: Unknown host: github.com

After restarting our Teamcity server (on AWS EC2) we were met with the error "List remote refs failed: Unknown host: github.com". We have never seen this issue before. At the moment the authentication is username/password (which have not changed). Wondering is there something we are missing here or if there is a fix for this.

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This is likely an issue reaching github.com from your TeamCity server. Are you able to try to connect to github.com from this server outside of TeamCity?

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