example12.text

---
title: 403 Forbidden
---

# Access Denied

Sadly, your client does not supply a proper User-Agent, and is
consequently excluded.

We have an inordinate number of problems with automated scripts which do
not supply a User-Agent, and violate the automated access guidelines
posted at arxiv.org \-- hence we now exclude them all.

(In rare cases, we have found that accesses through proxy servers strip
the User-Agent information. If this is the case, you need to contact the
administrator of your proxy server to get it fixed.)

If you are using the PDF Plug-in, it has many bugs and is forbidden here
due to problems it causes at the server end. You must confirm that you
have disabled it before access can be restored.

In Netscape try `Edit -> Preferences -> Navigator -> Applications`, look
for `Portable Document Format` and uncheck the plug-in box. Or delete
the pdf plugin dll file from the
`Program Files/Netscape/Navigator/Program/plugins` directory and restart
browser. Or for Acroread4/Explorer5 users, go into Acroread\'s
`File : Preferences : General : Web_Browser_Integration` and make sure
the little box is unchecked.

**Note to MacOSX users**: There is a bug in the Acrobat reader which
causes it to make endless streams of requests *after* having
successfully downloaded the full pdf. Note that it is not necessary to
use Acrobat at all, since pdf\'s from here render as well or better in
the default Preview.app on MacOSX. If for some reason you think you need
to use Acrobat, go to Acrobat `Preferences -> Internet` and turn off the
\"Allow speculative downloading in the background\" option, which comes
(incorrectly) turned on by default, and whose behavior is quite broken.

If you believe this determination to be in error, see
<https://arxiv.org/denied.html> for additional information about
restoring access and detailed guidelines for harvesting arXiv content.
**\[UPDATED: 12-18-2019\]**