The same problem (frustrated sunday). W2K event-log shows "The service could not connect Instance 5...". CGI/Fast CGI mode is running (with the event-log message), ISAPI is not running at all.

Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc.

If possible, make the script source available online and provide
an URL to it here. Try avoid embedding huge scripts into the report.

problem shows on any script, such as below:

<?php
 phpinfo();
?>

Do you have any Zend Extensions loaded in PHP.ini ? 

only Zend optimizer

Optimization Pass 1  enabled  
Optimization Pass 2  enabled  
Optimization Pass 3  enabled  
Optimization Pass 4  enabled  
Optimization Pass 5  disabled  
Optimization Pass 9  disabled  
Optimization Pass 10  disabled  
Zend Loader  enabled  
License Path  no value

Remove that extension and try again please.

We have the same problem... Unknown list entry type in request shutdown (2) in Unknown on line 0... and a lot of following bugs in every script... It seems that php is running for a short time correctly and then crashes.. We are not using Zend Encoder, so reason of this bug will be different. There was no change in our php.ini file, we use the same ini file in previous version of PHP (4.3.4) without any problem...

I'm getting this bug... I was upgrading PHP from 4.3.4 to 4.3.5.  I'm not loading any additional extensions, and I used the same .ini file as with 4.3.4.  I completely wiped out the C:\PHP files, and then loaded in the new ones (and made a new copy of php4ts.dll to system32).

Now, all of a sudden, I get 

Warning: Unknown list entry type in request shutdown (2) in Unknown on line 0.

Warning: Unknown list entry type in request shutdown (2) in C:\Inetpub\wwwroot\index.php on line 2

Then, dllhost gets a memory error, and all .php scripts on my website give this error:
"The remote procedure call failed and did not execute."

Shortly after, it works again, and then shortly after that I get the warnings again, and then it continues in the cycle of normal operation, warnings, and RPC failing.

If you have any ideas, please let me know.

I downloaded the 4.3.5 zip package for windows, and am running as ISAPI on Windows XP Pro sp1.  Every few page loads, "Warning: Unknown list entry type in request shutdown (2) in Unknown on line 0" (page itself is "<?php
phpinfo();
?>").

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

I have the same problem, it makes IIS down, and all website can not be accessed. Now I use 4.3.6 rc3, it fix this problem.

I got this error again, using IIS/Win2k Server/PHP (ISAPI) 4.3.6RC3_dev - are you sure its completely fixed?

got the same problem, it seemed to dissapear when i turn off error messaging and activated the log file (not the event viewer)
didn't install any patch (im running 4.3.5 release)