Port usage

The following ports are used by the CipherMail Gateway

External → Internal

Port Service Description
22 SSH Console access
25 SMTP MTA
443 HTTPS Web GUI

Internal → External

Port Service Description
25 SMTP MTA
80 HTTP CRL download
139 SMB/CIFS Remote backup and restore
443 HTTPS SMS gateway
445 SMB/CIFS Remote backup and restore
11371 HKP HTTP Keyserver Protocol

Note

If some functionality is not required, for example backup on a remote SMB share, some ports can be closed.