UltraVNC

Exillion's work-around seems to be forgetful: Now our servers need 1-2mins again to show login screen. Seems that the certificate download is tried again after a period of time (30days, for example) and if the firewall is closed again: Wait.

Some more experiences with this workaround: It seems that a connection to 64.18.25.38:80 has to exist just once. Now when the firewall is closed again, CTRL-ALT-DEL is still processed withing a second. It seems that the CRLs are just downloaded once or the signature has to be valitated just once per ...

I can confirm this being responsible for those delays. We are also suffering from this problem.

After reading this post I asked our network administrator to temporary allow direct access to 64.18.25.38:80 bypassing the firewall: Windows logon window appeared within a few seconds.
Of course he would ...