Upgrading our server after Internal Server Error occured
We have Economy 4 GB Dedicated Server Plan. Our site was getting error when we have 1000+ concurrent users. It goes slower as well. We have tried restarting the server, and checking error logs via ftp (no strange errors). We also increased our MySQL max_connections to 2000 (151 is the default) as we think this can also one of the cause of internal error. Doing all those steps don't prevent the error.
One thing could also cause the error is the .htaccess we have, and below is the setup: