Let me first say I am getting ready to retire this server, but still have to keep it going for the next few week.
A little under a month ago all of the sudden my ISA Server 2006 Standard stopped allowing more than 2 VPN connections at a time. It is configured to allow 15, but for some reason as soon as 2 users connect in it stops allowing any more connections and those users who attempt get an 806 error.
This is PPTP VPN connection by the way, so simple, no shared key or certificate to contribute to the issue.
Nothing has changed on this server as far as updates, patches or configuration is concerned, and we did not have any issues prior to this. That is on top of the fact that it does still allow connections, but only 2 at a time.
All of that said, around the time this started happening, though I can't say whether it was before or after, I ran Forest and Domain prep for 2012 so that I could add a 2012r2 server to my network to run as volume license manager for Office.
Could the forest/domain prep have caused this issue, or could it simply be that the old hardware, one of the NICs maybe is failing and is causing issues?
Manning