Nightly Cache clear breaks redirects

[nhorvat123]

In our Sitecore environment (version 7.2), we have one CMS server, and two CD servers (one for QA and one for Production) with two web servers for each environment. When I create the redirects and publish them to their respective targets, they work perfectly fine.

The issue arises when it looks like the Sitecore cache is clearing each night. On the CMS server's URL Rewrite logs, it looks like it is adding the redirects to the cache, and when I go to the cache admin screen, I can see that the cache looks like it has been built properly. When I look at the web server's URL rewrite logs, the redirects are not being added to the cache.

The following things will allow the redirects to start working again:

1. Unpublishing and republishing the redirects to the CD servers.
2. Restarting the site in IIS
3. Recycling the App Pool for the website

After unpublishing and republishing the redirects, I can go to the web server's URL Rewrite logs and see the inbound rules being refreshed in the cache.

Any idea what could be going on and how I can fix this?

[iamandycohen]

Why is the cache getting cleared every night? Is that a custom clearer that you built?

[nhorvat123]

I am not 100% certain that is what is actually happening, but it was all I could see. I looked into Sitecore caches and it looks like all of our settings in the site's web.config are pretty standard.

This is what I am seeing in our logs and what made me believe that the cache was getting cleared and rebuilt:

[iamandycohen]

What version of the module?

[nhorvat123]

I installed version 1.7.2 of the module, assuming that corresponded with version 7.2 of Sitecore.

The CMS server look fine for the morning builds:

So it seems like it is something on the web servers that is not building the caches appropriately.

[iamandycohen]

Can you send me the assembly? iamandycohen at gmail dot com

[nhorvat123]

I sent it over this morning. Let me know if you got it or if you need anything else.

[nhorvat123]

URL.Rewrite-1.7.2.zip

[iamandycohen]

Perfect. I will check it out.

…

On Fri, Mar 3, 2017, 6:46 AM nhorvat123 ***@***.***> wrote: URL.Rewrite-1.7.2.zip <https://github.com/iamandycohen/UrlRewrite/files/816779/URL.Rewrite-1.7.2.zip> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#31 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAxmf9atlUWRz4NSVJxkN9rhVdWDWrKmks5riAuWgaJpZM4MNLJW> .

[iamandycohen]

Please try replacing the Hi.UrlRewrite.dll assembly. If this works, then I will commit the code.

Hi.UrlRewrite.zip

[iamandycohen]

My bad... that code didn't even execute the ExecuteResult call that performed the redirect.

Please try this code, and follow these instructions:

1. Start sitecore
2. Hit a url that should redirect
3. Verify that it redirects
4. Clear the cache using the Cache Admin tool
5. Hit the same url that should redirect
6. Verify that it redirects

This should illustrate the same functionality as waiting over night.

If this works for you, then I will commit my code and upload a new package for all!

Hi.UrlRewrite.zip

[iamandycohen]

What happened after you manually cleared the cache with this patch?

[nhorvat123]

After I manually cleared the Sitecore cache, the redirects still did work, so that definitely helped!

[mstodd]

This isn't working for me.
After unzipping the zip from March 16 and putting the files in my site's bin, if I:
Create a redirect
Test it successfully
Clear cache
Test again

The second test doesn't work

Re-saving the redirect gets it to work again
This is with Sitecore.NET 7.5 (rev. 141003) and redirect 1.7.2 + March 16 patch