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?
Remote Desktop Protocol (RDP)
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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