Change port after update to 5.0

[wtempel]

@parrot If you decide to change the port

1. check the ephemeral port range, which may have been customized by the sys admin:

cat /proc/sys/net/ipv4/ip_local_port_range

1. select a port
   • outside that “ephemeral” range
   • and no smaller than the output of the command

     cat /proc/sys/net/ipv4/ip_unprivileged_port_start
     

   • and no larger than 65526
   • and such that the port and the 9 ports above it are not used by any other services on the computer, such as, for example, other CryoSPARC master instances that may be running on the same computer
2. run the command
   cryosparcm changeport 9999
   where 9999 should be replaced with an actual port number that meets all the requirements above.