Also if the tcp listen is enabled only one xschem ...
# xschem
s
Also if the tcp listen is enabled only one xschem session can use it. If you need more you need to change the tcp port number,
xschem --tcp_port 2023
The xschem --tcp_port xxxx
is my recommended way to start xschem with tcp enabled when needed , instead of leaving it enabled in the xschemrc file.