Yes, nerver used port 400.

Tried with ports 10445 to 10460 with the same result. I verified in

/etc/services that they are free ports, unlike the others I had used

before.

"ps" gives as a result:

[paz@arch-paz ~]$ ps -ef | grep cin

paz        62968   62445  0 17:46 pts/2    00:00:00 grep cin

Then:

sudo kill 62445

the result does not change; always the same error.

From /etc/services you can see that port 400 is associated with

"osb-sd; [tcp/udp]" (Oracle Secure Backup). I don't even know what

that is and I don't understand how to not have the render farm see it.