I have successfully installed separate instance of SDP 9118 on the same server which running productive version of application. 

It works, but after setting up few parameters and importing users from AD, ability to log in with local admin credentials was somehow lost, so only domain users (without admin privileges) can access the system now. I am sure about the password, it hasn't been changed since this is just first steps of system installation.

Does anybody know, how it could be fixed?

Thanks in advance,

Zafira