Try 6346 & if it doesn't work then try other port no.'s. Use port 80 as a last resort only. Some people have had success using different ports such as 3500 or 20282 for example. (With the tests below you must have LW running at the same time!!!)

You can try testing the port no.'s with these tests: http://www.grc.com/
http://home.no.net/tgrumpy/ct/dex.php
http://koti.mbnet.fi/gfactory/ctest/
http://jlh.no-ip.org/connectiontest/