If you are using Fastpath, with Apache (v. Apache22) proxypass to make Live Chat available via port 80 (or 443/SSL), you may need to set proxy-nokeepalive, no-cache, and downgrade. Otherwise the requests will not be sent and your customers will be left waiting on the timer screen forever.
Hope that helps
ProxyPass / https://127.0.0.1:9091/
ProxyPassReverse / https://127.0.0.1:9091/
SetEnv downgrade-1.0 1
SetEnv proxy-nokeepalive 1
SetEnv no-cache 1