Port forwarding on the router tells it to forward all traffic coming in to that port (remotely initiated) to the internal device address you specify.  I would guess that this is the feature that you are looking for...

Poer Forwarding does open ports but only the ones necessary to do the task specified.  Tivo should tell you which one needs to be opened and your router manual can tell you how to do it.

Very good. Ummm, what's an internal device address? If I specify it, where do I get it?

BTW, off topic.
My Dell 2350 router. Can I connect a wired device (ethernet) to a wireless router?

The internal device address would be the IP Address on the LAN of the router.  Linksys would be 192.168.1.1 while Netgear and D-Link use 192.168.0.1

Answer to part two, yes.

I've been holding off on jumping into this thread because it was unclear exactly why you would need to open ports.  Opening ports via port forwarding is used to allow servers and users outside of your local network to get through the router's firewall on specific ports.  Since your Tivo is supposedly on your local network, it is already behind the routers firewall and should not require port forwarding.  It would, however, require that any software firewalls running on your network be configured to allow local network traffic.

Steve

Forgot a question. If I open ports does that not compromise my firewall (security)? Is the port open to outside the wireless network?

I thnk the Tivo needs to communicate with a server to update schedules and the like therefore the reson to open the port and yes open ports do compromise security so don't open anything more thna necessary.

I know nearly nothing about routers/firewall except I want to be as secure as reasonably possible. Here is all I know.
http://customersupport.tivo.com/knowbase/root/public/tv2073.htm?

Okay, we are getting somewhere.  These are the ports that needs to be opened on your PC to enable you to retrieve recorded shows from the Tivo.  YOu will need to configure the Windows Firewall or whichever one you use to have thses ports open:

• TCP Port 2190
  
  
• UDP Port 2190
  
  
• TCP Ports 8080-8089

The Norton firewall has to be able to open ports or else you would not be able to reach the internet.  It is aloowing traffic back and forht on port 80.

OK, I understand that, I think.
1). But when I disable Norton Firewall (Windows Firewall is always disabled), that should be as good as opening ports, right? I should be able to connect to the PC. But I still get the same 'Server not found' message.
1). And, a Norton rep says Norton can't open individual ports.

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@jmwills wrote:
The Norton firewall has to be able to open ports or else you would not be able to reach the internet. It is allowing traffic back and forht on port 80.

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I can not disagree. I am an old guy and going on what the Norton rep told me.
Now I have looked through Norton and found no way to open/close ports. Any guidance will be appreciated.
Still, if I disable Norton, should that not be equivalant to opening all ports?

Okay, let's back up for a minute.  The Norton suite consists of a firewall product to monitor both inocming and outgoing traffic.  It is not a router.  To manage port activity, you must have a router, do you?  If so, you can get to the setup interface as I posted earlier.  Let's get that one item straight, do you have a router?

Yup. Have a router. Before I start, I was responding to
'The Norton firewall has to be able to open ports or else you would not be able to reach the internet. It is allowing traffic back and forth on port 80.'
For this reason I was curious how to open ports in Norton Firewall.
Still, I have disabled Norton Firewall, Intrusion Protection, Privacy, and Antivirus. With all these disabled,and with a continuing inability to get Tivo to find my server, I suspect the problem is not Norton. BTW, the server address TIVO wants is the IP address to the PC.
And, since Tivo can get 'outside' my network through the router to phone home and update my Tivo information every night, it now seems to me Tivo has to be able to find the router. If, in fact, this is correct, (and since Tivo says the DVR and software is set up correctly), I am running out of ideas.

No. I seem to cause more confusion with each post. Two issues.
First, TIVO can go through the router to update itself. TIVO appears, to me, to find the router and get an open port easily. Plus, TIVO has an IP address assigned by the router.
2nd issue is when I tell TIVO to go to IP address for the PC so it can find and display photos residing on my hard drive, I also 'Server not found.' It is this failure that I do not understand. With the router firewall, I think, not a problem, I disabled all Norton sw except Ghost. Still TIVO complains of no server. From this, I assume (having no knowledge of firewalls) Norton Firewall is not really causing the problem either since I suspect a disabled firewall means no ports are currently closed by the firewall.
Since TIVO people say I have everything related to TIVO set up correctly, I am searching for ideas.
From this initial post I have been able to, I think, rule out the router itself as a problem and likely should move on to another community. The problem with this is I have no idea what could be causing this problem so I have no idea where to post my problem next.
Hope all this clarifies things some.