Recently made some changes to a wordpress blog.
Using the WordPress iPhone app, I tried to re-add it.
(iOS 4.01 | WP App 2.6.2)
It authenticated fine.
Got the “good to go” message.

Then, “bad username or password errors” whenever it tried to retrieve the blog info.

I thought the bug might have been bad cached info (first authentication was fine, subsequent may have been using old data.) A re-install of the app resulted in the same problems. Adding of other blogs went fine.

Again, tried re-adding.
I tried using http://BLOG_URL/wp-admin

But when doing that, I was now faced with a new required field: XML-RPC.

It could not figure it out on its, and gave me the error “could not find the XML-RPC endpoint of your blog.”

So, I manually entered http://BLOG_URL/xmlrpc.php

That seemed to do the trick.

Often buggy, but when it works, the app is great.