Local TCP/IP Client Fails--No SNA Servers Found in (Sub)domain

ID: Q236098

The information in this article applies to:

Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2
on the following platforms: Win95, Win98

SYMPTOMS

When you configure an SNA Server 4.0 Windows 95 or Windows 98 client for Local client mode and the TCP/IP transport, the client SnaBase may fail to locate an SNA Server and displays the following error message:

SnaBase
ERROR: No SNA Servers found in (sub)domain DOMAINNAME

This intermittent problem started to occur at a customer site that had hundreds of SNA Windows 95 and Windows 98 clients and who had configured their TCP/IP routers to forward UDP broadcasts to five SNA Servers in the subdomain. At times, the clients would fail to receive a response from an SNA Server within the 3-second client timeout interval, causing client startup problems.

CAUSE

The server-side SnaBase service is improperly handling client UDP startup requests, delaying 200 ms before responding to a client discovery request. Under heavy client load, these requests can be queued on the server, resulting in a delayed server response past the 3-second client timeout interval.

RESOLUTION

To resolve this problem, obtain the latest service pack for SNA Server version 4.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack

WORKAROUND

Configure the SNA Server Windows 95 or Windows 98 clients for Remote client mode, where the client locates the server by name and does not rely on the UDP response from the server.

STATUS

Microsoft has confirmed this to be a problem in Microsoft SNA Server version 4.0, 4.0 SP1, and 4.0 SP2. This problem was first corrected in SNA Server version 4.0 Service Pack 3.

MORE INFORMATION

The server-side SnaBase has been changed to respond immediately to client discovery requests received over TCP/IP or IPX or Banyan (except on named pipes, used by old LAN Manager clients) instead of waiting 200 ms.

Additional query words:

Keywords : sna4sp3fix sna4 sna4sp1 sna4sp2
Version : WINDOWS:4.0,4.0 SP1,4.0 SP2
Platform : WINDOWS
Issue type : kbbug