event id 4307

I've a LAN with 4 XP-Pro and a a Server 2003 SE SP2. They are in a workgroup,

not a domain and the server is just a file server. All the PCs have a static

IP address, C class, 192.168.1.x and a flag in the Wins menu "Use NetBios on

TCP/IP".

Since few days ago, all the PCs report in the event viewer:

Event Type: Error

Event Source: NetBT

Event ID: 4307

Description: Initialization failed because the transport refused to open

initial Addresses

However, the LAN PCs works fine except a client that sometimes is not able

to connect to the LAN e, sometimes freezes: no keybord, no mouse, no

ctrl-alt-canc.

Any idea to solve the problem?

Thanks.

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ricc