<hostname> is not accessible, one way only

[kedde]

Hi!
I have a small network with only 2 computers connected via a switch. My
problem is that 'computer A' can browse 'computer B's folders and
files, but not the other way around.
When I use the explorer from 'computer B' typing the IP in the address
bar I get the error message 'computer A is not accessible' after a
while.

Addititional info:
I can ping both ways, I have no firewall between the machines and they
have the same TCP/IP configuration.
They are in the same workgroup and both machines have the same
user/password.

Can anyone please tell me what to do. Thanks in advance.

Kedde

 

[kedde]

Forgot to tell that both machines are Windows 2000 professional

 

[Bob I]

Open device manager and check power management on the NIC in computer "A"

 

[kedde]

Both computers has only checked the setting 'Allow the computer to turn
off this device to save power'.
Computer 'A' has an extra virtual network card used by a 'Symantic
Enterprise VPN client'.

I have noticed that only when computer 'A' is browsing computer 'B',
computer 'B' can also browse computer 'A'.