Unfortunately I didn’t manage to create universal OpenID plugin which would’ve worked on every hosting and with every wordpress theme. Therefore I decided to collect all the problems users had with it and solutions in this post.

1. You can authorize writing a comment but don’t see it. When you try again you see: Duplicate comment detected; it looks as though you’ve already said that!

Check whether there is a directory tmp in the plugin directory and if it has writing permissions.

2. You see a message: Fatal error: Call to undefined function: curl_init().

Your hosting provider doesn’t have CURL library. You can try to convince your hosting provider to install it. If it’s not successful you can try to replace all the curl functions with corresponding php-code. If someone has already done it send me a copy, please. I’ll publish it here.

3. When you’re trying to leave a comment on other site you get: No input file specified.

Try to remove a backslash after server.php in the first line of function add_server_info in the file openid.php and reactivate the plugin.

If you’re continue having problems with the plugin try the alternative version.