Steps. If you not have ASM/BM not tested..
1. Turn Profile Manager off in Server app.
2. Also in Server App: go into Profile Manager>Volume Purchase for Apps and Books>Configure
3. Open Profile Manager admin pages/Apps and Get more apps. Login with your VPP account and download the token
4. Click on Replace Token in Server App
5. Disable Volume Purchase by turning the slider off
6. Click Done
7. Look in Profile Manager, Apps should be empty and look for the active tasks
8. Re-enabled the VPP in serverapp
Apps should be back as before, and Active Tasks (same before stop working) Then leve all as it is.
If the push stop working after upgrade to server 5.9
and you do this step and the push starting working again
the server has very much to do to update apps and settings
so leve all to working...
not restart not touch any tasks.
Reinsatll serverapp i think not help beacuse you have back all the stuff from postgres DB
This what i think have to do with VPP and tasks, the steps above start the push again,(maby) after i upgrade to 5.9
one of my servers i running good for 3, weeks, after 3 weeks, i do sudo command to clean every Active Tasks and Completed tasks
after that push stop working.Then i do all this steps and like i say not touch anything.
Still working.. so far 2 weeks now.
If it still not working try the steps again. :)
Sorry for my bad spelling ...