Linux: Standard Ports
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Standard Ports
| Port | Protocol | Service |
| 21 | TCP | File Transfer Protocol (FTP) |
| 22 | TCP | Secure Shell (SSH) |
| 23 | TCP | Telnet |
| 25 | TCP | Simple Mail Transfer Protocol (SMTP) |
| 53 | TCP | Domain Name Service Servers (DNS) |
| 53 | UDP | Domain Name Service Servers (DNS) |
| 80 | TCP | HTTP |
| 88 | TCP | Kerberos |
| 110 | TCP | Post Office Protocol (POP3) |
| 139 | TCP | Network Basic Input/Output System (NetBIOS) session Service |
| 143 | TCP | Internet Mail Access Protocol (IMAP) |
| 144 | TCP | Secure HTTP (HTTPs) |
| 443 | TCP | Secure HTTP (HTTPs) |
| 10080 | UDP | Amanda Backup Client |
| 9101 | TCP | Bacula |
| 9102 | TCP | Bacula |
| 9103 | TCP | Bacula |
| 9102 | TCP | Bacula Client |
| 4379 | TCP | CTDB |
| 993 | TCP | IMAP over SSL |
| 500 | UDP | IPsec |
| 5353 | UDP | Multicast DNS |
| 2049 | TCP | NFS4 |
| 631 | TCP | Network Printing Service (Server) |
| 631 | UDP | Network Printing Service (Server and Client) |
| 1194 | UDP | Open VPN |
| 995 | TCP | POP3 over SSL |
| 1812 | UDP | Remote Authentication Dial In User Service (RADIUS) |
| 1813 | UDP | Remote Authentication Dial In User Service (RADIUS) |
| 11111 | TCP | Redhat Cluster Suite |
| 21064 | TCP | Redhat Cluster Suite |
| 5404 | UDP | Redhat Cluster Suite |
| 5405 | UDP | Redhat Cluster Suite |
| 139 | TCP | Samba |
| 445 | TCP | Samba |
| 137 | UDP | Samba |
| 138 | UDP | Samba |
| 137 | UDP | Samba Client |
| 138 | UDP | Samba Client |
| 69 | TCP | TFTP |
| 69 | TCP | TFTP Client |
| 16509 | TCP | Virtual Machine Management |
| 16509 | TLS | Virtual Machine Management |