About TCP/IP ports used by IBM Engineering Requirements Management DOORS

IBM Engineering Requirements Management DOORS requires three TCP/IP ports to be configured when used in a client/server environment, especially across a WAN with a firewall in place:

1. Database Server Port – Default: 36677

2. License Manager (FlexLM) Port – Default: 27000

3. License Vendor Daemon Port – Must be explicitly specified (say 27001) if behind a firewall

Port Details

1. Database Server Port

During installation of the DOORS database server, a default port number of 36677 is assigned.
This port must remain consistent unless intentionally changed.
DOORS clients must be configured with the correct port number to connect to the server.
Responses to client requests are returned via a dynamically assigned port on the database server.

2. License Manager (FlexLM) Port

DOORS uses FlexLM (also known as FlexNet) to manage license connections.
The default port used for connecting to the FlexLM License Manager is 27000.
This port must be specified in the client configuration.

3. License Vendor Daemon Port

By default, the license vendor daemon port is randomly assigned by the operating system.
However, to enable operation across a firewall, this port must be manually assigned.
This is done by adding a port number to the VENDOR line in the license.dat file on the license server:

VENDOR ibmratl PORT=<port_number>

For example

VENDOR ibmratl PORT=27001

Additional Notes

DOORS clients can send email notifications (for example, failed login attempts, Change Proposal System alerts).
For this, SMTP port 25 must also be open on the client side.
This port should only be used for email and not shared with other services.