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Loosing Internet Connection After 55 Users, Why?

When I atempt to add a 56th, 57th, etc..... user to my network they are able to access the intranet but not the internet. I am running a Windows enviroment, with 2 Windows 2000 Servers. I have prenty of user licences. I have tried diabling the licecnse manager, did not work. DHCP scope is plenty big enough. I have a SonicWall Pro 200 with unlimited licenses. DNS seems to be running fine, except I have noticed that it does not release the host name once that user has been taken off the network even though it is set to. I am running out of options, can you please help?
2 Solutions
sounds like the problem could be with the  router and/or firewall configuration....

what happens when one of those clients try to connect to the internet?
what is the result of a nslookup on one of those client computers for an internet site.... ?

do all settings look correct when you do a ipconfig /all on the client computers that aren't connecting to the internet?

if all these check out, then it's most likely that the router or firewall configuration is causing the problem.....

>>SonicWall Pro 200 with unlimited licenses
triple check the licenses on this appliance (most likely this is where the issue is)
mcse84Author Commented:
Ok I feel Stupid, I over looked the problem. It turned out that there was a set of ranged addresses set to deny in the access rules of the firewall. Who ever set this it up originally must have had a reason then, because there is no need for it now. I would like to thank both of you for pointing me back to the firewall. I was thinking it had to be in the server settings.
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