Serv-U high availability listeners

This article describes the port configurations for high availability in Serv-U MFT.

Serv-U Server #1 - define these listeners on EACH Serv-U Gateway:

• 10021: FTP and explicit SSL/TLS
• 10022: SFTP using SSH
• 10080: HTTP
• 10443: HTTPS (SSL encrypted HTTP)
• 10990: Implicit FTPS (SSL/TLS)
• ALSO: Set your FTP passive port range to 10500-10509 (on "Server Settings | Network Settings")

Serv-U Server #2 - define these listeners on EACH Serv-U Gateway:

• 20021: FTP and explicit SSL/TLS
• 20022: SFTP using SSH
• 20080: HTTP
• 20443: HTTPS (SSL encrypted HTTP)
• 20990: Implicit FTPS (SSL/TLS)
• ALSO: Set your FTP passive port range to 20500-20509

Load Balancer - define the following service pools:

• 21 (FTP and explicit SSL/TLS): Assign to ports 10021 and 20021 on each Gateway (4 ports in all)
• 22 (SFTP using SSH): Assign to ports 10022 and 20022 on each Gateway
• 80 (HTTP): Assign to ports 10080 and 20080 on each Gateway
• 443 (HTTPS (SSL encrypted HTTP)): Assign to ports 10443 and 20443 on each Gateway
• 990 (Implicit FTPS (SSL/TLS)): Assign to ports 10990 and 20990 on each Gateway
• 10500-10509 (Serv-U #1's passive FTP ports): Assign to ports 10500-10509 on each Gateway (requires "sticky sessions" as described below)
• 20500-20509 (Serv-U #2's passive FTP ports): Assign to ports 20500-20509 on each Gateway
• Also set "sticky sessions" (all connections from the same IP source address will be sent to the same destination) on 21 (FTP and explicit SSL/TLS) and 990 (Implicit FTPS (SSL/TLS)).