Unknown MySQL server host

Question

When trying to connect to my database server, i encounter the problem of unknown host:

Warning: mysqli::mysqli() [mysqli.mysqli]: (HY000/2005):          


        

Answer 1

I know this is an old question. But I ran into this same issue today, and none of the answers I found were the right one.

The issue in my case ended up being that port 3306 is not open on our firewall, and I was attempting to connect to an internal mysql database from an external server.

I'm not sure why the error it gives you is "Unknown Host" in this case. I would have expected something more like "Unable to connect." or "Connection refused.", but using the exact same code from an internal server worked fine, leading me to this conclusion.