I have an open ticket with Paessler but thought I'd throw it out here too.
I have PRTG (latest version) installed on a Server 2012 R2 VM, running under a Server 2012 R2 host. Plenty of resources - SAS drives, 8GB RAM allocated to the VM etc. The VM is a clean install.
When I RDP to the VM, I can login in about 1-2 seconds. That includes running a few GPOs to map drives, set registry settings, etc. Normal LAN stuff.
But when I install PRTG and start the two services, RDP to the VM takes about 150 seconds. Yes, 2.5 minutes.
If I then stop the PRTG services, logoff RDP, log back on, I am back on in 1-2 seconds. Start the services, log off, log back on, and it's 150 seconds.
Last week i started again. Created a brand new VM, installed PRTG, migrated my PRTG data as per the KB articles, and...same again, back to 150 second login with the PRTG services running.
WMIDIAG reports no errors on either the VM or the parent OS (other than an ASP namespace, which is normal when IIS is not installed). Also, I've enabled GPO logging and there's nothing obvious there.
RDP to any of my other VMs - similar spec - all take 1-2 seconds, and that's running the same GPOs (same username, same AD OUs and groups). It's ONLY my monitoring VM and ONLY when the PRTG services are running,
I'm at a complete loss. It looks 1000% like it's PRTG that's the cause of the slow logins - stop the services and login is back to normal speed - but I can't see any conflicts and I can't imagine what might cause it.
I'm open to suggestions please :-)