Implementing Arcserve Backup › Configuring Arcserve Backup › Configuring Firewalls to Optimize Communication › Ports Used by Arcserve Backup Components › External Ports Used for Communication

External Ports Used for Communication

Arcserve Backup uses the following external ports for communication:

Port 135

This is owned by Microsoft endpoint-mapper (Locator) Service and is not configurable. All Arcserve Backup MSRPC services register their current ports with this service.

All Arcserve Backup clients (for example, the Manager) contact this service to enumerate the actual port used by the Arcserve Backup service and then contact the service directly.

Port 139/445

This is owned by Microsoft and is not a configurable port. Arcserve Backup services use MSRPC over the Named Pipes transport. Microsoft requires this port to be open for all communication using MSRPC over Named pipes. Be aware of the following:

• Port 139 is used only when the Arcserve Backup services are installed on Windows NT.
• Port 445 is used only when the Arcserve Backup services are installed on Windows XP, Windows Server 2003, and Windows Server 2008.

Port 53

This port allows Windows computers to reach each other using Domain Name Server (DNS) communication. Arcserve Backup uses port 53 to enable name resolution, which allows primary servers, stand-alone servers, member servers, and agent servers to communicate with each other.

You can find Microsoft Windows System port requirements at the following URL:

http://support.microsoft.com/kb/832017/en-us