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When I try to open an attachment from email or try to open a pdf file, I get a window popping up that say error 403. I am not able to open any files or close the page. I have to force quit in order to get rid of the screen. I have deleted adobe and reinstalled and get the same message.
Error 403 is associated to forbidden access to a resource.
There are too many things involved here that could be the problem:
I am having the same issue - 403 Forbidden error code when I try to click on a shared PDF that I created... why would I be forbidden on a document that is mine?
Did you follow th suggestions of Amal and you still get the error?
The only thing I can think of at this time is to create a new shared folder with no read-only restrictions to all the files and sub-folders that you will save in that directory.
I am thinking that if you upload the original PDFs to that new unrestricted shared folder, you may be able to see where the problem is... but this is just an idea.
Sometimes, shared folders permissions may revert back to default settings during system updates.
I've seen this recently and very uncommon with new updates to MS Windows 10, not sure if this would be your case though.
I am not sure if the same happens under macOS systems.
If this would be the reason that triggers a 403 error, we should assume that a feature that used to work before is now blocked or deprecated, or even going through an experimental beta stage.
You may have to identify which feature is blocked and manually re-enable it using the hidden configuration manager of the current web browser that you're using and test if you can open these shared PDFs.
In addition, you may also test with additional supported web browsers other than Google Chrome and see if you get the same 403 error.
You may be able to test by reverting back (roll-back) to an older version of the web browser too.
Last, see if changing the DNS settings from "Automatic" to manual does any difference when you assigned a different DNS from a different service provider, like Google's public DNS.
See this guidance for example:
One last thought, you may also try to access that same link to your shared folder using a mobile device and see if you get the same access error.
If you don't get the error and are able to access your PDFs from another computet or the mobile device, then we can narrow down the problem to the current user account in the computer that you're using.
To troubleshoot with an alternate method, you can create a new user account with administrative privileges in that same computer, and then check if you can access your shared files.
We are sorry for the trouble and the delay in response.
++ Adding to the discussion
You may please try the following steps and see if that helps:
Let us know how it goes