Can’t ping server outside the network

Hi,

the title of my question describes the problem.

I’m unable to ping my server at home by the IP address. It times out. Inside my network, I’m able to ping everyone and everything.

I am running ISA on the server, and the problem probably relates to that, but I don’t have any filters on incoming ICMP packets. ICMP packets are allowed to go through both ways.

Could it be anything else perhaps?

Any input will be helpful