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Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Click on link and get Disallowed Key Character

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I click on a web page link to go to a document in this case it looks like a PDF and I get a browser window that says "Disallowed Key Character" This pharse does not show up in Firefox help anywhere

I click on a web page link to go to a document in this case it looks like a PDF and I get a browser window that says "Disallowed Key Character" This pharse does not show up in Firefox help anywhere

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That text is what the server sends if you access that link:

So it looks that either the file is missing or the link is broken otherwise.

Which page has that link and do all links on that page behave like that?

You can try to contact the site to inform them that the link is broken.