Problem
You printserver drops connections and might run at 100% CPU usage.
Environment
You will notice following entries in logfiles:
W [08/Sep/2020:10:07:10 +0200] Max clients reached, holding new connections...
W [08/Sep/2020:10:07:10 +0200] Max clients reached, holding new connections...
W [08/Sep/2020:10:07:10 +0200] Max clients reached, holding new connections...
Solution
Increase the number of maximum allowed clients. As of now this is not possible by ucr variables until this bug is fixed.
Step 1
Edit the template file. Note: Editing a template file is usually not recommended as the file might not get overwritten during a future update.
Edit
vi /etc/univention/templates/files/etc/cups/cupsd.conf
Look for the line with MaxClients and remove the hash sign in front of it. It should look like this:
MaxClients 300
Step 2
Write the changes to the configuration file:
ucr commit /etc/cups/cupsd.conf
Step 3
Restart cupsd
systemctl restart cupsd