Cannot Connect to ISA Server

I have an ISA Server 2006 installed on Windows Server 2003. I only want one computer to use the ISA Server for internet access. When i configure this server with a network address range none of the computers can ping it. Even when i create a firewall policy and allow pretty much everything through including ping the other computers still can't ping it.
The ISA Server can get on the internet and i can log on to it remotely. But the internal computers can't use it as a proxy.
Not sure where i am going wrong.
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nealerocksConnect With a Mentor Author Commented:
I have reconfigured ISA with the single network adapter template. It now does what we want it to.
If you have done installation of ISA from remote controle then it will allow remote system IP address to perform admin task like ping and remote ctrl. as it adds that system into remote admin rule.

By default ping traffic is not allowed from any machine to ISA server.
By default ISA proxy uses port 8080. check proxy settings on client pc with this port.
rest everything is game of rules, check that is configured properly. Network is define properly as internal and external. Keep eye on Monitoring which will tell you what is going wrong on your ISA.
nealerocksAuthor Commented:
The installation was done locally. I have created a firewall rule that allows ping smtp http https dns etc.
I have changed the proxy to use port 8081 and the client is also using that port.
The ISA server only has 1 NIC. Dont really want to use it as a firewall. Just want it to be a proxy so i can block some websites.
since ISA Server is a state full firewall, it is important to have one rule set that allows the internal rangae see the isa server correctly.
topest rule ( internal>local) and the scound top rule (local>internal).
to solve the problem temproraly  , config both rules to allow full portocol access from both sides to each other.
then you can customise the rules to allow only the specific protocols you need .
you can use logging>monitoring tab to check which rul is denying the client access to tcp port 8080 on isa server.
make sure the http porxy is enabled correctly on isa server.
Good Luck
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