Weird, > use nodebb switched to db nodebb > db.objects.update({ _key: "config" }, { $set: { "maintenanceMode": 1 } }); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }) NodeBB restart. It's working, checked APC and the switch is turned on. I think i was loged in as administrator before, but i was checking maintenance page in APC and switch was turned off.

Does the forum logs give an error when it crashes? Do you have mongo and nginx logs on? There should be some useful information in one of the logs as to what is happening.

@julian it persists even after disabling it Yes the problem was with plugin, but my data did not got imported completly, after 57k topics now its impoting only 1 topic in 1 minute. What should i do now ?