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Server blocking To protect ourselves, our customers, and the quality of our service, we reserve the right to block any IP address or ports. We block outbound traffic to the following ports at all times: port 25 – to prevent spam ports 137, 138, 139, 445 – to protect customers from a Microsoft SMB/CIFS security issue ports 1900 and 2869 – to protect customers from malicious UPnP configuration.