ISA server SOCKS / Firewall issue

We have ISA 2000 installed on SBS 2003 Premium. The server is dual homed.

We run an application on client PCs for which weve created packet filters / rules on the ISA server to enable communication with the external server that the client app talks to.

All this worked ok until a few days ago, now the clients cannot see this external server. If I restart the MS Firewall service they can see the server for a couple of seconds then the connection is lost.

I see errors / warnings like the following in the Application log:
SOCKS filter: failed to bind IP address 1080 for listening. Event ID 20002

And

Cannot load an application filter SOCKS V4 Filter ({25765C04-C80B-494C-914E-286297DB8C8E}). FilterInit failed with code 0x80072740. To attempt to activate this application filter again, stop and restart the Firewall service. Event ID 14060

Can anyone help?

We have ISA 2000 installed on SBS 2003 Premium. The server is dual homed.
 
We run an application on client PCs for which weve created packet filters / rules on the ISA server to enable communication with the external server that the client app talks to.
 
All this worked ok until a few days ago, now the clients cannot see this external server. If I restart the MS Firewall service they can see the server for a couple of seconds then the connection is lost.
 
I see errors / warnings like the following in the Application log:
SOCKS filter: failed to bind IP address 1080 for listening.
 
And
 
Cannot load an application filter SOCKS V4 Filter ({25765C04-C80B-494C-914E-286297DB8C8E}). FilterInit failed with code 0x80072740. To attempt to activate this application filter again, stop and restart the Firewall service.
 
Can anyone help?

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