Can't upload

Just signed up loaded the client and ran it for a while. When I pressed "q" to upload I got this error:

"You seem to be experiencing network problems, or may be using an invalid handle.

Please correct and try again.

Done."

Could it be because I am behind a firewall? It pulled just fine when I set it up. Also when I start the client I get a no response from server error but it still continues to fold.

Any ideas?

System Specs:
Dell 4300
WinME
128MB Ram
Networked
Running the text based client instead of the screen saver

I have ran SETI, Folding @ Home and Genome @ home on this machine with no problems at all.

I loaded the client on my home pc which is not behind a firewall and it is working perfectly.

Did you already go to the site and register a handle?

Yes I did.

As I stated it is working on my home PC with no problem.

I just can't get it to upload thru my firewall at work.

Please read the section in the readme on firewalls and proxy servers.