Friend cannot connect to Project 1999 or any server.

[Jimsox]

After re-reading your post I realized I misunderstood your scenario, which is why I pulled my original suggestion.

Did your friend accidentally patch the game beyond Titanium by chance? You can double check by hitting the "options button" on the EQ Emu launcher and see what "client-type" has selected.

If somehow the game was installed then patched beyond Titanium that might be related.

Other then that I'm not much help with the router question. What model router are you using?

[Lyra]

Search these forums for "5998 Blocked"

I did and there are a lot of suggestions. Rather than me try to guess which would apply, you will probably see something helpful.