After I learned about the defective ISO here I have already written, I have come across another error.
Die Exchange Server 2016 Installation ist immer wieder mit dem Fehler „Installation product \exchangeserver.msi faild. Fatal error during installation. Error code is 1603.“ abgebrochen.
While searching, I came across a few possible solutions, but none of them led to the desired result. Most write defective ISO, some write that IPv6 must be active, others write about deactivating the creation of 8.3 file names on NTFS partitions. All implemented without success.
Disable creation of 8.3 file names on NTFS partitions
Nachdem ich dann einen ganzen Tag in die Fehlersuche und Lösungsversuche investiert habe, ich habe es mit Dateiaustausch und den ISOs für CU10, CU11 und CU12 versucht und immer die gleiche Fehlermeldung erhalten, also konnte es nicht an einer defekten ISO liegen. Da bereits zuviel Zeit in die Fehlersuche investiert wurde, kam ich zu dem Entschluss den Server mal komplett neu aufsetzen zu lassen. Die Server wurden von einer anderen Abteilung aus einem Image Template bereitgestellt, somit ließ ich den Server mal von einem „frischen“ Image installieren und siehe da, die Installation lief anschließend ohne Fehler durch.
The problem was probably due to a faulty server image or a Windows update that was installed later. Unfortunately, we have not yet had time to analyze the error further. As soon as we have found the cause, I will provide an update here.
What I noticed during the analysis is that the Copying Exchange Files Part counts up to 100% and after a short time jumps back to 0% and then cancels the installation. At this point, the data on C:\Windows\Temp\ copied. I suspect that this could be the problem. The files are completely deleted when jumping back to 0%. But this needs to be investigated further.
If you also have this error, you might want to consider setting up the server again if other solutions don't work.