Most likely, this happens when many chat requests were done from the same IP. The PHP Live! system has a default chat request limit from the same IP address. The default is 5 max chat requests from the same IP address.
$VARS_MAX_IP_CHAT_REQUESTS = 5 ;
If your company network shares one IP and you are conducting test chats, the system will only allow max 5 chats from the same IP. If you need to increase this or simply remove the feature, simply update the variable as you see fit for your system.
The following documentation will detail the proper procedures for updating system variables:
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