Windows IIS Server - recurring Class not found errors

[nbcommunication]

Hi,

We recently launched a PW site (3.0.62) on the client's own Windows IIS server. After a bit of research on the forums and some back and forth with their IT team, I got the site running, with ProCache too.

Twice in the past month the site has gone down, due to a really peculiar error. It's as if PW can no longer find files on the server even though they are still there. Here's an error from today:

Page: http://www.sitedomain.org/http404
User: guest

Error: 
Uncaught Error: Class 'ProcessWire\PageAccess' not found in C:\Websites\sitedomain\admin\files\web\wire\core\Page.php:3666
Stack trace:
#0 C:\Websites\sitedomain\admin\files\web\wire\core\Page.php(3688): ProcessWire\Page->getHelperInstance('PageAccess')
#1 C:\Websites\sitedomain\admin\files\web\wire\core\Page.php(3566): ProcessWire\Page->access()
#2 C:\Websites\sitedomain\admin\files\web\wire\core\Page.php(3276): ProcessWire\Page->getAccessTemplate()
#3 C:\Websites\sitedomain\admin\files\web\wire\core\Page.php(3265): ProcessWire\Page->___isPublic()
#4 C:\Websites\sitedomain\admin\files\web\wire\core\PagefilesManager.php(481): ProcessWire\Page->isPublic()
#5 C:\Websites\sitedomain\admin\files\web\wire\core\PagefilesManager.php(343): ProcessWire\PagefilesManager::_path(Object(ProcessWire\Page))
#6 C:\Websites\sitedomain\admin\files\web\wire\core\PagefilesManager.php(328): ProcessWire\PagefilesManager->___path()
#7 C:\Websites\sitedomain\admin\files\web\wire\core\PagefilesManager.php(268): ProcessWire\PagefilesManager->path()
#8 C:\Websites\sitedomain (line 3666 of C:\Websites\sitedomain\admin\files\web\wire\core\Page.php)

The first time it happened it wasn't the 404 page, and it was TextformatterVideoEmbed that seemed lost. This then developed into other, more important, files not being found (Uncaught Error: Class 'ProcessWire\RepeaterPageArray' not found).

I tried refreshing the module cache and clearing complied files (I think I even cleared the cache folder completely) and permissions seem fine. The first time it happened the client's IT team restarted their server and the problem was resolved. They couldn't see anything in the logs, nor had they made a change to the server.

There doesn't seem to be a trigger for it happening either.

Does anyone here have any experience with running PW on Windows IIS, and/or have any ideas why this may be happening?

Cheers,

 

Chris

[matjazp]

I'm running a few sites on IIS and never had problems, although I don't use ProCache (would you mind sharing web.config in regards to ProCache)? I also develop on IIS and everything works. Did you consult IIS/PHP log files? Event viewer?

[nbcommunication]

Hi matjazp,

Unfortunately I don't have access to logs, basically just a file browser from a simpler time...

The web.config was just hobbled together from various bits and pieces I found, although mainly based on one person's work for a 2.5 install on IIS I think - I wish I could remember who it was/where I found it. Anyway, that should be attached...

The errors started happening again last night (Class 'ProcessWire\Pagefile' not found) but only lasted for 15 minutes that then stopped. Totally weird, totally frustrating, and I'm almost 100% sure it's totally not the fault of PW too!

Cheers,

Chris

sample.web.config

[FrancisChung]

Do you know if the server was patched in the last month, and what sort of patches were applied?

Are you able to get hold of an older backup of a server, restore that on a test server and see if that runs smoothly or not?

[FrancisChung]

If you have a working Apache webserver where the site runs without issues, you could try converting its htaccess file to web.config.

Here are some resources :

https://blogs.msdn.microsoft.com/azureossds/2015/04/23/converting-apache-htaccess-rules-to-iis-web-config-using-iis-manager-for-azure-websites/
http://cbsa.com.br/tools/online-convert-htaccess-to-web-config.aspx

If you are able to browse to these locations, you should definitely try and have a look at the logs>

https://stackoverflow.com/questions/6426375/where-can-i-find-the-iis-logs