MN100 Win98SE and Dungeon Siege Server

I am running a MN 100 router.I can host a Dungeon Siege
server one time,then it will not show on the internet
again.If I reload my router config from before the
server,it will work again.

I had all the ports required for Dungon Siege(as per MS)
forwarded to the host.After running the server one time,I
can no longer run the Directplay Test in DX Diagnostics,I
get a failure at step 9.

I can run servers for Battlefield 1942(dedicated) all day
long,shut them down and restart without any trouble.
Could this be a problem with UPnP support and Win98SE?
I am having a similar problem trying to run a dedicated
server for Hidden and Dangerous 2 as well.I tried hosting
a server at a friends house using WIN98SE and a different
Router.We had no problems getting server to show up
online.I used the exact same port forwarding on my
MN100,and it will not show up.

Also,when I get the error running Directplay test in DX
diag,I can disconnect my PC from my router and run the
test again without errors.