First Look Voice viewer and Windows 2003

I know it is not mentioned as supported on the download page (which shows Windows XP and Windows 2000) but it is not clear what the plan is. My main computer runs Windows 2003 Server since I use it for dynamic Web site creation. As soon as "Enable voice chat" is checked, the computer loses Web access and apparently loses TCP/IP capability. Normalcy returns as soon as Task Manager is called up and "SLVoice" is killed (via End Process).

Will this always be an unsupported OS for voice viewers? Other current versions of SL work fine on Windows 2003 Server.

In your router, do you have a 'enable Upnp' facility? This function when enabled allows Upnp programmes to control your router, which can result in a Null signal being sent to turn off the connection. Or are you using a proxy connection?

UPnP was enabled. So I disabled UPnP and re-started the router, but the result was the same: "Unable to connect. Login packet never received by login server."

I have a Linksys WRT54G router. Are there any other settings that could be relevant? Do you think it is the OS (Windows 2003 Server) that is the problem, or other running software, or the router?

Note that the TCP/IP communication for the computer is blocked always at the same point during the SL login process, when the viewer is handshaking with the region. And it is always fixable right away by killing the SLVoice.exe process.

You could try creating a 'profile' in your router, that allows the ports to be accessed. There is a post in the forums that show the exact ports. You might also try the exceptions tab in the windows Firewall to make sure that all the slvoice programmes are checked. The SLVoice.exe programme handshakes with the 3rd party servers at the point of loggin and therefore maybe seen by your OS as a 'alien' programme piggy backing from a main programme (although I am not familiar with the Windows 2003 Server OS).

EDIT[ Quote from the poster with the port details:
Did all this which is from the knowledge base:

How do I configure my hardware firewall (such as a router)?

Hardware firewalls need to allow access on certain network ports. Second Life needs to connect to ports 443/TCP, 12035/UDP, 12036/UDP, 12043/TCP, and 13000-13050/UDP. You should configure your firewall to allow outbound traffic on those ports, and related inbound traffic. You'll need to consult your firewall's documentation, or the manufacturer's website, for instructions on how to make these changes to your firewall. As of Version 1.13.2, released Jan. 10th, 2007, you may need to enable UDP/TCP in order to access Second Life.

and it solved the problem]

Oh man, I thought that was it! I opened up port forwarding, but no luck. I will keep trying, I believe you are right it is a router setting. I wonder if there is a way to log the packets going back and forth and see where it all gets stuck. I CAN run the First Look Voice viewer, as long as Enable voice chat is not checked, and could then check the box. Any thoughts?

Thank you for all your good ideas.

Have you checked SLVoice.exe in the Exceptions Tab of the Firewall applette in Control panel? Your firewall maybe blocking it, also do you run SpyBots 'Timeglass' applette in your system tray? That has a nasty habbit of auto blocking programmes.