How to run Wordpress admin on a different subdomain?

Question

I have the requirement of running the Wordpress admin over https. We use a cdn to deliver cached content for the site but the cdn cannot accept secure traffic (only one SSL cert per IP allowed, and we run several sites off it). I cannot control redirects for httpS://www.mysite.com/.

I would like to have:

http://www.mysite.com/blog/
httpS://secure.mysite.com/blog/wp-admin/
httpS://secure.mysite.com/blog/wp-login.php

I have tried rewriting the urls as suggested in the article http://codex.wordpress.org/Administration_Over_SSL#Virtual_Hosts.

Hypothetically, you could use a host with a different name, such as wpadmin.mysite.com

Unfortunately trying this as suggested still sends me to httpS://www.mysite.com/blog/login.php.

# No matter what it redirects to the wrong subdomain for login.php
http://www.mysite.com/blog/wp-admin/
-> httpS://secure.mysite.com/blog/wp-admin/
-> httpS://www.mysite.com/blog/wp-login.php.

Also when directly going to the css files still link to the wrong url (.)

The simple solution would have been to run the blog off http://blog.mysite.com/blog/. Unfortunately this has been tried and was decided against for SEO reasons.

Is there anyway Wordpress can do this?

Solution 1

Have you looked into this thread? It is a mod on the WordPress HTTPS plugin.

Solution 2

Not too sure if you have seen this article but it's pretty comprehensive when it comes to Wordpress Admin over SSL. Scroll down to the part about Virtual Hosts, and there is information there about setting up the wp-admin as a subdomain.

http://codex.wordpress.org/Administration_Over_SSL