Otto 2.5.7 and older won't start after FileMaker Server 19.2 upgrade
There is an issue with Otto versions prior to 2.5.8 and FileMaker 19.2 on some, but not all Windows Servers. The v2.5.8 release resolves this issue by eliminating the dependency on the FMS_HOME variable.
Description of problem
Upgrading to FileMaker Server 19.2 removes a Windows environment variable named "FMS_HOME" that points to the FileMaker Server directory.
Otto won't stay started after upgrading to 19.2
It gives an error on install that refers to nssm.exe not being able to run a command.
Windows Only - The macOS version is unaffected.
The easiest solution is to upgrade to the latest version of Otto. If that is not possible, adding the environment variable manually resolves this issue. This video walks you through the detailed steps you need to take: