Welcome to the forum @DD1D.
You may want to
- determine which process is using the relevant port. Consider a suitable
sudo sscommand, similar to the one mentioned under Web interface is not connecting due to port issue - #2 by wtempel. - ensure there are no lingering processes](https://guide.cryosparc.com/setup-configuration-and-management/troubleshooting#id-2.-find-and-if-necessary-terminate-zombie-processes) related to your own CryoSPARC instance, but be sure to not inadvertently disrupt someone else’s CryoSPARC instance.
Which command did you use to change the port?
- Did you select a port range that is
- not overlapping with ports used by another application and/or another user
- and outside the ephemeral port range configured on the computer
- Did you use the
cryosparcm changeportcommand?