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Community Access from Sandbox Suddenly Broek
I'm experiencing a strange problem that cropped up yesterday morning. I am suddenly getting a 'page not found' error when trying to access my community in my sandbox org. I have not changed any of the custom URL settings in weeks and was accessing and using the sandbox community the very night before without issue.
Sandbox: https://sandbox-hirebotics.cs51.force.com/ (<-- page not found error)
Production: https://robots.hirebotics.com (<-- works fine)
After three phone calls / go-to-meetings with salesforce support they can't figure out what's going on. Their latest guess is that my product custom URL in sandbox (which is copied into sandbox upon a refresh, which I haven't done in a week) is set to "in development". But they can't tell me why that's a problem now nor how to change that, assuming that's the problem. They suggested I post here. See below.

Now, I also tried spinning out another developers sandbox from my working production org and I'm seeing the exact same problem accessing the login page hosted from this new dev org.
Note that the error page below is being served from my org as the email us link connects to my email address.

Also, both my sandbox and dev sandbox are hosted on CS51, if that's relevant.
Any idea what's going on?
Sandbox: https://sandbox-hirebotics.cs51.force.com/ (<-- page not found error)
Production: https://robots.hirebotics.com (<-- works fine)
After three phone calls / go-to-meetings with salesforce support they can't figure out what's going on. Their latest guess is that my product custom URL in sandbox (which is copied into sandbox upon a refresh, which I haven't done in a week) is set to "in development". But they can't tell me why that's a problem now nor how to change that, assuming that's the problem. They suggested I post here. See below.
Now, I also tried spinning out another developers sandbox from my working production org and I'm seeing the exact same problem accessing the login page hosted from this new dev org.
Note that the error page below is being served from my org as the email us link connects to my email address.
Also, both my sandbox and dev sandbox are hosted on CS51, if that's relevant.
Any idea what's going on?
Interestingly, if I switch the sandbox community to the standard 'Tabs + Visualforce' (ie, no theme other than standard salesforce look and feel) the pages serve up just fine. When I switch back to the new Napili theme, it breaks again.
Production is working fine. I even spun out a dev org based off production and that dev org is broken like my regular sandbox.
The sandbox should bring you to a standard community builder login page based on salesforce's new templates (no customizations other than the logo like you see on the production link).
What I've seen is if I have an issue with a lightning component, I get an error in the component portion of the page (but my template header is still present). In this case, it looks like it can't find the template pages to serve up.
Can you pull those customizations all the way out and see if the "naked" Napili theme works at all in the sandbox?
(Keep on support's rear on this one - don't let them do the pass-the-buck shuffle)
The reason why you encounter this issue in the developer sandbox is probably because you may have community pages that are not published yet in the sandbox.
1. Go to Commuity Management. The "Community Home" should be pointing to a "Community Builder Page" like in Production. That may not be the case in your developer sandbox and it might be pointing to the "Default page".
2. Go to the Site.com Studio (you'll find the link to it in the same page in step 1)
3. Locate the Site Pages and Publish them.
4. Try loggin in as the community user now and you should be able to successfully land on the Community home page in the developer sandbox.