An appropriate representation of the requested resource /admincp/plugin.php could not be found on this server.

When I try to install vbSEO Sitemap, I get this message:
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Not Acceptable

An appropriate representation of the requested resource /admincp/plugin.php could not be found on this server.
Apache/1.3.41 Server at forums.aspiemania.us Port 80

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The only thing is, when I check with my FTP program the file exists. I re-downloaded 3.7.1 and uploaded the specific file but it did not solve the problem.
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My forum address is http://forums.aspiemania.us

That's related to mod_security that your host must have installed.

HTTP 406 Error: An appropriate representation of the requested resource... - vBulletin.org Forum

Thanks for the explanation.

I applied the fix but now get this message:
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No file uploaded and no local file found.

Never mind. It installed now. Thanks for the 406 page Keith.