Installation procedure failed in Configuration Wizard, message "Failure updating ASP.NET Script Maps". Orion services weren't started.
After that I tried to manually start Configuration Wizard again. It started from scratch and failed in Website configuration with message "Web Request for Orion/login.aspx failed, Error 401 Unauthorized." Orion services were started.
Then I've remembered that I have Windows AD Passthrough Authentication enabled and I've enabled anonymous access in IIS configuration for Orion website. In third attempt with these settings, I was allowed to run only web portion of Configuration Wizard, which failed updating ASP.NET scripts again.
I wasn't discouraged yet ;-> and ran the web portion of Configuration Wizard for the fourth time. It stopped in the step "Validating Website" for about 10 minutes, but finally finished successfully.
Above that I am satisfied with new web performance and I am looking forward to pure ASP.NET version of Orion to see events, web resources etc. in our date/time regional settings.
Any clues about reasons for such behavior? Anyone with similar experiences?