Strange connectivity issues between workstations and Servers

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http://serverfault.com – I have a situation whereby there are 3 sites. Site a - User site Site b - User site Site c - datacentre Site a can talk to site c fine Site b can not talk to everything in site C In particular, workstations in site b are struggling to communicate properly with site c. For example - there are servers that we can ping, tracert, even telnet on port 80 (or other app ports) to but cannot for example browse network shares on them. Microsoft Network Monitor shows connections are made during these attempts, but I cannot browse and get the following message: "\\server\share" is not accessible. (HowTos)