no, the firewall is not installed.
I noticed the problem when I was trying to access the Internet. I would open up Mozilla and nothing would happen. I checked if I can ping anything and the ping to 18.104.22.168 cameback successful. Then I pinged another DNS server, 22.214.171.124, and it came back OK. I pinged google and it said that it could not resolve the server. So I pinged 126.96.36.199, which is google's IP address and it came back successful. So I thought that I have a DNS problem, that I could resolve mnemonic addresses. But then I put DNS servers' addresses manually and I still had the problem. When I put 188.8.131.52 in Mozilla, it opened the page with no problems. So I pinged localhost, it came back successful. I pinged 127.0.0.1, again fine. But my local IP address is not good. The manual says that if localhost is not successful, then it's the TCP/IP stack problem and TCP/IP needs to be reinstalled. But if local ip address is not successful, then it's the ethernet card. But it's not the card because the I can ping other hosts. Also, everything worked fine just a couple days ago when I was at home. And not in the dorm it's not happy. I know it's my computer because I hooked up my friend's computer and everything was OK.