I am having a problem with my limewire pro connection all of a sudden. I have had Limewire pro for well over a year and it worked great with a turbocharged connection. In the last month or so, I have no connection. Keeps telling me I am behind a firewall with the brickwall icon at bottom. I have done everything the forums tell me to do as far as turning of Mcafee, windows firewall and checking upnp enabled and port forwarding for my router. I have uninstalled and re-installed limewire. I have change every setting I can possibly think of to get it working again, but I still get the brickwall icon. Please help!

OS Windows Vista
Firewalls McAfee and Windows Firewalls both with exceptions (full Access) for Limewire
Ram 3.0 GB
Hard disk space available 284 GB
Connection Type Broadband
Router name Netgear Rangemax wpn824 v2
Connecting from home with administrator privaleges
Version of Limewire Pro 4.18.8 and Java 1.60_11
ISP Comcast
TEST WORKED
Sharing NO
New problem with experienced user
Brickwall Icon Yes
uPnP is enabled on router
Security McAfee
Live in USA
Nothing in setup has changed. Comcast modified modem settings to prevent sending email on port 25. Email must now be set to send email on port 587. Port 587 uses authentication. I use incredimail. It works just fine.