Why get 404 error all of a sudden?

My Linux Apache website has been working fine for a very long time.

All of a sudden, earlier today I keep getting 404 file not found error messages for images, .pdf files, css and any non-.html o or non-php file.  This is so strange.

The only think I changed today was my email address in Plesk. Nothing else.

Any idea what would cause this type of issue.

A file that was accessible fine a few hours ago all of a sudden is giving a 404 warning error?

Everything else works
Paul KonstanskiProject SpecialistAsked:
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GaryCommented:
The obvious question - do the files still exist?
Are you sure nothing else has changed?  Maybe PHP has been upgraded?
Is this shared hosting?
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gheistCommented:
Anything in error log related to errors?

Maybe you installed some f apache rate limiting modules recently, then with mail addresss change users download all pages again instead of checking etags and you hit ratelimiter now and then.
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Jim RiddlesPrepress/OMS SpecialistCommented:
Building on what @Gary asked: perhaps folder permissions have changed?  The files may indeed exist, but if your web server can't access the directory, they might as well be gone.
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samriCommented:
The first think that I would be looking at is the apache error_log file.    Most obvious would be either missing files, folders, or the permission to those files/folders itself.

I do not have much experience with Plesk.  So I am not sure if changing email address could trigger the 404 error.
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Paul KonstanskiProject SpecialistAuthor Commented:
It was a technical issue on the server side. They initiated an update that failed and they had to roll back a change.
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Paul KonstanskiProject SpecialistAuthor Commented:
All good suggestions, but ultimately it was something different.
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