Remote mysql database crashes under moderate load

[Andy Lamar]

I'm hoping someone can help me with this.

If I have mysql on localhost we have issues once we get to around 9k users (server has 64GB ram)

So we ordered a server with 128GB RAM and moved mysql to this server, now when It gets to around 5k users it seems to drop a few hundred users and give this error on web application

Warning: mysqli_connect(): (HY000/2003): Can't connect to MySQL server on '10.1.1.1' (111) in /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php on line 84 Warning: mysqli_autocommit() expects parameter 1 to be mysqli, boolean given in /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php on line 86 Fatal error: Uncaught exception 'MysqlException' with message 'Connect Error (2003) Can't connect to MySQL server on '10.1.1.1' (111)' in /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php:89 Stack trace: #0 /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php(55): Mysql->getConnection('10.1.1.1', 'stalker', '1', 'stalker_db') #1 /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php(64): Mysql->getConnectionForWrite() #2 /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php(140): Mysql->getConnectionForRead() #3 /var/www/stalker_portal-4.8.79/server/lib/admin.class.php(52): Mysql->from('administrators') #4 /var/www/stalker_portal-4.8.79/server/administrator/login.php(10): Admin::checkAuthorization('******', '*****') #5 {main} thrown in /var/www/stalker_portal-4.8.79/server/lib/mysql.class.php on line 89

Then after I refresh a couple of times it will come back, but It never gets past 6k users, when I move back to mysql on localhost this does not happen.

Any clue what can be causing this?