This article was previously published under Q194465
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Your Windows NT Server computer running the Point to Point TunnelingProtocol (PPTP) may encounter periods where all new client connections willbe refused. These periods only last three to five seconds but can happeneven when there are Virtual Private Network (VPN) adapters still available.
This problem only happens when clients are dialing in using NetBEUI. Theclean up period after a VPN bound to NetBEUI can last three to fiveseconds. During this period, the VPN will refuse any connections. When theVPN refuses the connection, the server then thinks that all the connectionsare being used and refuses the entire connection instead of passing theconnection on to another VPN.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.