samko: "... the domain name when logging on to a server is actually too long so the last let[ter] is always cut off"
How long is "too long"? My domain name is 15 letters.
I have the identical situation, tried the same combinations, to no avail.
I get a warning on the Checking Standard Credentials, and failures on the two vix tests.
Win2012R2 for both the backup and target (SQL) servers. ESXi 6.0 and VBR 9.5.
I also made this registry adjustment:
"For 2012/2012 R2, you must change the “EnableLUA” DWORD to 0 in HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\policies\system"https://www.veeam.com/kb1788