We recently upgraded from Enterprise 10.9.1 to11.3. Prior to that we had editable SDE, sync enabled layers in our SDE database as REST endpoints on our Stand Alone ArcGIS Server and added to our AGO.
This system had been working for several years and folks were going offline in Field Maps and editing directly into our database. After the upgrade in late November they stopped working. We could no longer sync our offline edits into SDE. (We are not federated with AGO, these are RESTs just added to AGO. They are secured with the password embedded).
We've been working with ESRI to resolve the issue with no success. We can download the map without any issues. We even tried to pre-create an offline map and the same error. Once we edit offline and go to sync we get the following error message.
JSON parser invalid start of JSON. < : 0
We look at the log files on the stand alone ArcGIS Server and there are no entries showing any attempt to sync back. Has anyone else had similar issues? I realize most folks use hosted feature layers in AGO but they cost credit and this process has saved us a lot of credits.
Another note we can add to the map and we have even downloaded the file geodatabase from our devices and features have been added.
Thank you