Home network not working properly since installing Comodo [Resolved]

I’m running a home network with a router, a desktop and a laptop (wireless connection), all Windows XP SP2. Both are running Comodo The problem I have is that since I installed Comodo on my desktop machine, I can’t access any files or my printer on the desktop from the laptop. I get an error message:

”\Desktop\SharedDocs inot accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Not enough server storage is available to process this command.”

This is a one-way problem. The desktop can fully access the laptop but not the other way around. When I open My Network Places on the laptop, I can see the shares on the desktop machine, but I can’t open anything.

The network was functioning properly before I installed Comodo. Any help would be appreciated. Thank you.

It would seem the CFP rules on your desktop machine are blocking your laptop. For network sharing to take place, the desktop needs to allow incoming connections on the Windows networking ports: 135, 137, 138,139, and 445. One or more of those ports is being blocked, and so keeping your laptop out.

Could you please tell me how to find the ports you mentioned and how to unblock them? thanks.

The ports are probably being blocked by default, so there isn’t an explicit list. In which case, you’ll need to add a rule (Global Rule, probably) to allow traffic. This should work,

Allow IP In&Out from Zone[My LAN] to Zone[My LAN] where protocol is any

That rule will allow anything and everything between your desktop machine and your laptop (and anything else on your LAN). From a security perspective, that’s much too permissive, but to solve the immediate problem it should do the job. It can be tightened up later.

Global Rules are at Firewall → Network policy, tab Global Rules.

Note that Global Rules are evaluated in order from the top down, first match wins. This new rule should be up near the top.

When i went to the Global Rules, i noticed there was a blocking rule in red. I removed that and that resolved the problem. Thanks a lot for your help.

Glad to have been of help.

Now that things are working, I’ll lock this topic for reference. If it needs to be reopened, just PM any of the moderators.