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Previously the problem is when I access the ISPConfig web hosting and web access to ISPConfig (https://XXXX:8080) appears an error like this "Warning: mysql_connect (): Too many connections in / usr / local / ISPConfig / interface / lib / classes / db_mysql.inc.php on line 76 Warning: mysql_connect (): Too many connections in / usr / local / ISPConfig / interface / lib / classes / db_mysql.inc.php on line 76 ".
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Ok,so your connection Limit is too low:
set:
max_connections = 500
max_user_connections = 500
in postfix my.cnf in the [mysqld] section and restart mysql.
Then check the file /etc/resolv.conf and ansure that all dns servers listed there exist and are reachable from your server.