Pfsense have one website with connection timeout

[jackli123]

Hi guys.

currently, we are using pfsense as router. and there is one website that having connection time out, we try tracert that website without problem. and ping also no problem. we also tried to connect to different website at the same, everything seems works fine.

the biggest problem its not always connection timed out, its between few hours the problem appears.

i have been doing solve the problem but no luck.

Current pfsense runing on esxi. with 8 core and 4 G ram.
esxi Maximum number of connections 11000.