browsing big network problem

We got very big network in our company. Some computers are working in one
workgroup and in one subnet (ex. 10.0.10.0/24). Other big part - computers in
several domains and different own subnets (ex. 10.0.6.0/24 or 172.17.0.0/16).

All subnets are cross-routed (Cisco routers). I can PING from my computer
any other computer from any other subnet. No problems.

My computer is 10.0.10.22.
In WinXP I can connect to the shared resources in our network using command:
"net use x: \\10.0.6.150\share ..." - and it works fine.
10.0.6.150 - server working in a domain and I neen to provide
username/pasword form this domain to connect. All works OK.

But in Vista I've got a problem. I still can PING any computer in whole
nework, but I cannot connect to any computer, that is not in my subnet
(10.0.10.0/24). PING 10.0.6.150 works, but "net use" on this IP or
"\\10.0.6.150" in search prompt not working - it says "Windows cannot access
\\10.0.6.150" and "Err. 0x80070035 - The network path was not found" - in
details.

Any suggestions or ideas?
May be Vista is using different IP ports for network discovery and these
ports are closed on our Firewall? What are these ports?

// sorry for bad english

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http://windowshelp.microsoft.com/com...orking_sharing