Well, we tried the following first:
- Backup config on old server using Softerra.Adaxes.BackupRestore.exe
- install new server with same name and IP
- restore config using Softerra.Adaxes.BackupRestore.exe
After that, we could use the Adaxes console on our computers as before. All security roles, configs, etc. where there as before. BUT no webconfig was available.
Then we found the linked article and tried it with installing the new server, with new name and new ip, installed adaxes as shared installation, waited a bit and we then could use the console connecting to the new or the old server. Then we shut down the old server and no webconfig was working anymore.
We are now still running on the old server cause transferring the webconfigs (we have 4) did not work.
This is not critical, cause Windows 2012R2 will still get security updates for some time, but sooner or later we will need to migrate to a newer Windows version.