Your certificates need to already be in order for this to actually work.
I’ve had iManager 2.5 blown up on my iPrint server for a few weeks now, which means I haven’t been able to do any administration of my printers. That’s bad. I tried to do an inplace upgrade to iManager 2.6, but that did nothing for me. I determined that the problem was somewhere within Apache, and ended up uninstalling Apache2, Tomcat, and iManager.
Oops.
iPrint itself is now broken. In my haste I didn’t stop to think that it actually relies on Apache for all of my printing, via the IPP URL….. so when I blew away Apache, I broke printing totally…… what now?
Time for lunch.
After eating a sub, I realized that my fix was an easy one; just reload iManager, Apache, and Tomcat off of the CD through the GUI, and it should re-write my config files. I can handle that. So I do this, and to my joy, iManager is back in business. However, printing through IPP is still not working. I check my Apache log screen, and see that it is not listening on port 631 like it should be. Now, I go digging through my httpd.conf, comparing it to my old version (yes, the backup saved my can today) and compared. They are basically identical except for one line at the bottom:
include iprint/ipp.conf
So I added this in, restarted, and everything is back online.
Now, it’s officially a ‘good day’. 
