Users in a branch office can ping the headquarters file server over a site-to-site VPN, but they cannot map network drives to it. A packet capture shows that traffic to TCP port 445 is being dropped by an intermediate firewall. Which service is being blocked by the firewall?
Server Message Block (SMB) / Common Internet File System (CIFS)
TCP port 445 is used by Server Message Block (SMB), also known as Common Internet File System (CIFS), for Windows file- and printer-sharing traffic. If traffic to this port is blocked, clients will be unable to map network drives or access shared folders on a Windows file server. DNS uses TCP/UDP port 53, RDP uses TCP port 3389, and DHCP uses UDP 67/68, none of which rely on port 445.
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