oes 2018 - logging into /ipcon produces 500 server error

[mdymes]

Hoping for some help here

Server = oes 2018 with latest iPrint addon installed (was just upgraded from 2015 sp1)

The /ipcon has never worked for me. Whenever i try and login, a 500 error is generated and requires a restart of Tomcat and apache. This setup did not work on oes 2015 either, I was knd of hoping the upgrade would have taken care of it. I have followed a few tids, like deleting the work directory, nothing has helped. When trying to login, the following output goes into the apache2 error log

[Wed Apr 11 14:00:08.504638 2018] [proxy_ajp:error] [pid 4917] (70014)End of file found: AH01030: ajp_ilink_receive() can't receive header
[Wed Apr 11 14:00:08.504663 2018] [proxy_ajp:error] [pid 4917] [client 10.2.8.53:50268] AH00992: ajp_read_header: ajp_ilink_receive failed, referer: https:// [server omit] /ipcon/login;jsessionid=8C6AB549217122AA0F883221EB2E78AF
[Wed Apr 11 14:00:08.504677 2018] [proxy_ajp:error] [pid 4917] (120006)APR does not understand this error code: [client 10.2.8.53:50268] AH00878: read response failed from [::1]:18009 (localhost), referer: https:// [server omit] /ipcon/login;jsessionid=8C6AB549217122AA0F883221EB2E78AF

I am able to login to the /print/printers page on this server.

I have removed the overlay and re-installed, no luck.