special network permissions being blocked

I sometimes try to log on to a wireless hospital network that requires you to go to their website to agree to their terms of service before you can surf the net. I used to not have a problem, but recently had to reinstall from clean install, version 5.10. I cannot use 5.12, it does not allow anything to load. So today I tried to log on at the hospital and it would only let me in safe mode. So I uninstalled the program and now don’t have a problem. I installed Microsoft Security Essentials temporarily until I can solve the problem. Any ideas why Comodo is blocking this permissions page and preventing me from getting online with the hospital network?

Try the solution given in No network connection after using Stealth Ports Wizard (DHCP Broken).

That will likely do the trick. If that does not help disable Block Fragmented IP datagrams. This setting is known to cause problems in large networks like for enterprise, universities etc.