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unable to access websites due to port143

Posted on 2009-04-16
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Last Modified: 2013-12-27
I have a qwest m1000 DSL modem.  when configure with firewall setting set to "Off(NAT)" i am unable to access certain website such as any Microsoft websites (MSN Hotmail Microsoft) nor can i access Experts-Exchange!  However, if i change the firewall setting to "Custom" and block IMAP (Port 143) i am seemingly able to access any website including all the ones mentioned above.  But, then i cannot use my VPN connect plus probably many other funtions that i am unable to test without accessing a network outside of mine.  I have tried to unblock all the ports in the "custom"  firewall setting to no avail (still cannot use VPN).  Certainly I am not the only one who has experience this problem.
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Question by:drest
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by:giltjr
giltjr earned 200 total points
ID: 24168746
With NAT turned off your firewall will pass your computer's IP address directly to the Internet.  Since most likely your computer has a RFC 1918 address (private) non of your traffic will flow over the Internet.

What you need to do is see if your firewall has a "allow VPN" traffic option.  What type of VPN connectivity are you supposed to use: PPTP, LT2P, IPSec?


You may want to read the 4th post here:

https://forums.qwest.com/qwbb/board/message?board.id=networking&thread.id=91
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drest earned 0 total points
ID: 24174116
qiltir, thank you for the response. It turns out that i had some port forwarding that was causing the problem.  After correcting the port forwarding settings, all seems to be working as expected.
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