Simulink Verification and Validation does not directly communicate with the DOORS Server via TCP/IP, over a specific port. It communicates locally with the DOORS Client via ActiveX; the DOORS Client typically resides in the same machine with the MATLAB installation.
The DOORS Client may communicate with the DOORS Server via TCP/IP and over a port determined by DOORS. Hence, if your current setup is working fine, then migrating to a different server is not likely to cause any issues with Simulink Verification and Validation if the DOORS client is able to communicate with the new DOORS server.
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