Troubleshooting
Editing the configuration file
It may not be possible to save the configuration file Apsis.Service.exe.config after having specified the Apsis account details. This is due to the fact that Windows protects files in C:\Program Files (x86) and requires administrator access to change data there. Open e.g. Notepad as Administrator (right-click, Run as administrator) and open the file as a workaround.
Error logging
Verbose logging output is always enabled and ends up in C:\ProgramData\Lundalogik\Apsis Integration\debuglog.txt. If things don't seem to work it is always a good idea to have a look in this file for a possible explanation.