Can you please post the hardware setup that this DNN installation is running under, just out of curiosity.  Also, can you post what kind of traffic the sites get?

Quad Xeon dual core CPU (8 CPU cores) (CPU is almost always at 3% or less)
Gigabit to the Internet
15k RPM RAID HD  (disk ques are always 0)
4 GIG of RAM  (Always underused)
Win2k3 Standard
SQL2000 (on another box, dual xeon dual core, 4gb ram, very underutilized)
1 DNN install being the only purpose of the quad cpu server
~7200 parent DNN portals

Right now my site gets a fraction of the traffic it used to.  This is because DNN is constantly crashing.  Also, DNN *WILL NOT* load unless i block the web port 80 manually and startup DNN by hand because the requests that occur while DNN loads causes it to crash.

I'm basically shafted.  My site, which used get a tad under 100,000,000 pageviews a month, now only gets 1/20th of that because of the constant crashings and inability to restart (application restarts do not work cause of DNN hanging on startup).

I'm dead in the water unless I can get this fixed :(

I know for sure this has something to do with the number of parent portals I have.  I know this because the problem has progressively gotten worse as more portals are added, as well as the troubleshooting I've been doing so far.

I'm just a normal guy, not a big company, trying to put together a huge fan site while absorbing all the costs.  Things were going well, very well, but then I grew and the crashings started.

So yea, any help would be massively appreciated!!!!

EDIT - My email address is  timgt  (at)  hotmail.com  if anybody has ideas.

Oops, yea I have tweaked the threads and connections for IIS.  So yea, its not a thread/pool issue.  No deadlocked state that I can see as far as IIS is concerned.

It is because I have >7000 portals and >110,000  pages (tabs).  That I don't doubt.  Why exactly?  Not sure!