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I'm running Wordpress (v3.5.2) in network mode.

Any of the sites which try to access /wp-admin produce a browser error saying there is a redirect loop. A redirect checker tool says the page returns a 302 temporary redirect to the same URL.

I have uploaded a default .htaccess file and the same thing happens.

In cPanel, I have checked Domains > Redirects, and there is no such redirect listed.

I have renamed /plugins to /plugins2, and the issue remains.

In the wp_options table, the site_URL is set to www.example.com, which is correct. This matches the DOMAIN_CURRENT_SITE parameter in wp-config.

Any ideas?

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I'm having this issue too, on a shared host. Other wordpress installations on this host do not exhibit this behavior. –  Jeff Paquette Aug 1 '13 at 17:19
    
Hi Jeff. I uploaded fresh copies of /wp-admin & /wp-includes which resolved the problem. –  Steve Aug 3 '13 at 2:58
    
I did that, without effect. However my hosting provider has noticed a segfault that may indicate bad RAM on the server. It's being replaced tonight. Fingers crossed. –  Jeff Paquette Aug 3 '13 at 3:19

2 Answers 2

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I ended up uploading fresh copies of /wp-admin & /wp-includes, as well as the wp files in the root / directory, which resolved the problem.

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In my case, it turned out to be an infected theme. –  Jeff Paquette Aug 4 '13 at 4:29

I had this problem as well, it turned out to be a hosting issue with the permissions of some of my files being chmod 0664 and the host not like group to be writable. I changed the files to 0644 and everything worked. There is never a clear solution to this problem, but that may help for people looking for other solutions.

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