Hi,

My site returns 404 error, but all pages are existing. I've just recycle my application pool and the site is back. I've checked event log but the I can't get more information my site cause to return 404 issues.

But other subsites using the same application doesn't have encounter the 404 at the same time.

Hi,

I believe that this is due to the code that fetches the tab dictionary not being thread safe. When multiple requests are made to a site it's possible that an empty tab dictionary becomes cached and therefore all requests return a 404 response until the application pool is recycled.

Further details and a code fix can be found at: https://dnntracker.atlassian.net/brow....

Hope this helps others.