Browser Errorsp : Event ID 8021

The browser was unable to retrieve a list of servers from the browser master \\***** on the network \Device\NwlnkIpx. The data is the error code.
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The browser was unable to retrieve a list of servers from the browser master \\***** on the network \Device\NetBT_Tcpip_{BFC8A218-110A-4048-AA4B-C523DFF1CAFB}. The data is the error code.
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Event Code 8021
Client is win 2k sp1
serv is win nt 4.0 sp 6a
most likley this is a simple problem, but its got me. I`m getting browser errors on the server too (when i reboot), and on the other win 2k computers too.