The following are some common troubleshooting issues:
IPP Page Fails to Launch On Upgrading From OES 2015 SP1 to OES 2018 SP1
ZLIB error during printer installation, profile creation, or upload
Dragging and dropping printers to a printer map might result in space restriction errors
iPrint Service Fails when Renaming a Volume Where iPrint Is Hosted
Upgrading iPrint on a Cluster Does Not Upgrade the iPrint Clients
iPrint LUM error when running the iprint_nss_relocate script
Upgrading iPrint Does Not Update the ICM parameters of the iprint.ini file