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This is the environment: Several Win 2003 SP 2 servers and several Win XP SP2 & SP3 clients. All in the same LAN. Firewall is disabled everywhere. No recent Windows updates or configuration changes.

This is the problem: Since last Thursday, I log on to any other server or workstation as any regular (non-admin) user and I fail to be able to open ADMIN SHARES ONLY (namely \\server1\c$, \\server1\e$ and \\server1\admin$). The error message is: "\server1\c$ is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.

Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed. Disconnect all previous connections to the server or shared resource and try again."

I can, however, open the same shares if I use FQDN or IP address:

\\server1.domain.local\c$

\\172.0.0.1\c$

Other shares do not have this issue and I can open them without any issue.

Any ideas or suggestion would be truly appreciated. Thank you in advance.

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Are you really using 172.0.0.0/16 internally? –  MDMarra Jun 26 '12 at 19:58
    
Of course not, it is just a fake IP address, which doesn't come to the point. What it is important is that the servers and clients are in the same subnet and that accessing the shares using the server's IP address works. –  ARomo Jun 27 '12 at 18:47
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