I have 2 of these servers thru GS and the banners have shown the servers as dead for weeks now.

I confirmed that the servers are up, running and joinable.

Tried the rescanning of the servers and it comes back advising they cannot be scanned.

Is there another work around for this?

There does not appear to be game specific advice, just the general advice that applies for all servers; My server will not add or shows as down, what should I do?

As the majority of other Insurgency Sandstorm appear to be scanning correctly you must logically assume that the issue is somewhere between your server setup and the GT scanners.
i.e. Game server config, server/router network/firewall config, ISP/game host, routers between ISP and GT.

It is also worth noting that Gametracker scanner IPs were recently updated; NOTICE: Gametracker Scanner IPs have been updated.

thanx for the suggestions. Much appreciated.

This all for the most part seems to refer to if i was running a home server or dedicated server at a data center.

I don't have the necessary control of the server. It is with gameservers.com and thus i don't have full access to the server to make some of the suggested changes.

In that case you absolutely must contact Gameservers.com directly for support.