Couldn't allocate any server IP port

[M4stah]

Server OS: Windows XP Sp3
Processor: Single core Pentium 4 2.35 Ghz
Ram: 1.2 GB
Game(s): Garry's mod 10 (private 10 slots)
Start Up Command: c:\srcds\orangebox\srcds.exe -console -game garrysmod +map gm_flatgrass -maxplayers 10 -autoupdate +ip 87.195.176.20:27005
Admin Mods: none

The problem here is that first the server couldn't be found publicly, because it was advertising with the internal ip. It has been joined and works(also by people outside my local network, so the port forwarding does work), until I tried to make it advertise it's external ip by the +ip command. Then I got the error in the title. How can I make the server advertise with the public ip?

[BEzOR]

I have your same problem, my only guess is that you need to forward the ports with that ip address (the external one)

[Mooga]

It will ALWAYS advertise your external IP. drop the IP line to put in your internal IP address. Make sure you forward your ports and post all the info found here: