I had problems connecting to the Internet, browsers, email, IRC etc. unless i disabled Norton Internet Security. I tried various things to correct it and finally ended up in System Wide Settings where i found a filter blocking all communications via tcp/udp, so i unchecked it and was able to connect to the Internet with Norton running.
The filter had a weird description which wasn't in English or any language, just odd symbols. If i disabled and renabled the programm the check mark activing the filter would automatically come back. I deleted the filter so it wouldn't come back.
Is my system compromised by not having this filter? Do i need to block tcp/udp?