Problem
This behavior can be caused by a print dialog, i.e. Save-as PDF.
When a dialog like this is triggered, the WebService handling SOAP communication from Mobile, will hang without any error message.
Solution
Does the operation performed from Mobile, entail printing a document?
If so: Make sure
- NAV Printer Selection points to the correct printer
- Service Tier User, has that printer installed
- Log into the server with the Service Tier user and install the printer
- Make sure the Default Printer on the server is NOT a PDF-printer or similar. Must be a real printer.