Problem with Page Not Found

I've been having the same problem with a semi-live little site. Started with 4.7rc1 and still have it with 4.7. I got around it for a while by setting the home to be a specific node, but now i need to fix it. Local and Drupal cache don't seem to be the issue.

EDIT: N/m, fixed it by putting node into the Default Front Page field.

Update:

I got it fixed. Phew!

Here's how:

Tips above pointed towards a cache issue. My Catch-22 problem was that I couldn't get to any admin pages, so couldn't get to Performance to clear caches.

Fortunately, I had Drush 5 already installed and used it to clear all caches (note to self: yes, I must get to know Drush better and use it more often):

$ drush cache-clear
Enter a number to choose which cache to clear.
 [0]  :  Cancel         
 [1]  :  all            
 [2]  :  theme registry 
 [3]  :  menu           
 [4]  :  css+js         
 [5]  :  block          
 [6]  :  module list    
 [7]  :  theme list     

1
'all' cache was cleared                                                [success]

That did it. It fixed things for both logged in and anonymous users.

Drush, I love you. Drush devs, well, I can't thank you enough.

Sweet. I'm now rather happy.

OK, I'll now do another total backup (and will resolve to do these more frequently), and will seriously think about replicating the site files and db locally (even though the site is one I work on voluntarily, there's such a thing as pride, and I don't want to be thought of as the guy who can't fix things when they break, so yeah, i'll probably clone the site and set it up locally, just in case, and might even try out module and core updates on the local version before implementing them on the production site in future).

I'll leave in my earlier (from 12 minutes ago), plea for help, just so you too can learn from my pain:

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Well, the oss-storage site looks like it's working again.

How did you fix it?

What did you do?

Was it a caching issue?

I'm looking for clues as something similarly strange has just happened to me with a Drupal 6 site:

- 'Page not found' started appearing for every page (even Admin pages) in one browser while logged in as Admin
- just the home page started appearing, whatever is clicked on, in another browser while not logged in (i.e. this is what a regular visitor currently sees)

I was clearing the Drupal cache at the time after making a minor CSS change to the default theme.

Now I can't get in to turn off caching, or reset default theme, or anything, even though the Admin menu still appears.

This is very frustrating, obviously. ;)

I've tried logging in as other users - they all get 'Page not found' straight away. I've tried closing browsers, clearing browser caches. Same thing every time right now - only the front page for anonymous users and 'Page not found' for anyone logged in.

In both cases, the URL changes, but the page content doesn't. Front page in one case, 'Page not found' in the other, whatever the URL displayed in the address bar.

If anybody has a tip as to what I might safely try before I try reverting to the last backup (though not sure how I'll do that even, as I can't get the Backup and Migrate page to load!), that'd be great.

Right now, due to the logged in Admin user being unable to do a thing, I can't even get the maintenance page up. (Yes, it's a production site, no I've no local copy.)

I've got Drush installed, so could try using it for a restore, I think (though what would I be restoring - a pre last Drupal update state? Might this not cause more problems?).

All ideas welcome!

Thanks.