I am installing a fresh install of Exchange cu8, not an update a straight install. However it takes many hours to install, many more than have previously experienced. It is non Internet facing. The area it takes its time on is compiling assemblies. The ngen.exe retries 6 times each taking around 7 minutes each. Until it errors and continues with the install.

Have disabled certificate revocation check within Internet Explorer and have even added clr.microsoft.com to the hosts files pointing to 127.0.0.1.

Have tried registry keys for speeding up the timeout for crl checks,  buy no joy with that either. 

Is there anything else that can be looked at?

• Edited by Gallaway087 12 hours 16 minutes ago

Hello

tip: disable virsuscan if have, and need what is step where "slow" ?

and check installer log: C:\ExchangeSetupLogs\ExchangeSet

Thanks for the reply.

I got the information I posted from the exchange install log.

It's the ngen.exe in the v4 .net framework folder. It's almost like it's doing 6 certificate checks. ..taking 7 mins each. ...then failing, despite me un checking the option in Internet Explorer.