westerfunk

Same here, same error.

On 1and1 host myself … after getting this error and troubleshooting for a while, what finally worked was disabling all of my plugins, I ran the upgrade, and it worked.

DO THIS AT YOUR OWN RISK!

BACK UP ALL YOUR FILES BEFORE YOU START MANUALLY EDITING THE CODE!

I have a solution that works, but it requires some extra code. It differentiates between a web client hitting the web server directly (as in most hosting situations) or hitting the web server through a reverse proxy. I wrote this code a year ago for another site I own that runs behind an Apache reverse proxy I run at home.

I took this code and then added it to a my-hacks.php file I created in the WordPress root directory. Then, I went into the WP-Admin and turned on the my-hacks.php legacy functionality under Settings, Miscellaneous.

Here’s the code:

<?php

function writeIPAddress() {
	if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) == '') {
		return $_SERVER['REMOTE_ADDR'];
	}

	else {
		return $_SERVER['HTTP_X_FORWARDED_FOR'];
	}
}

?>

Then I took the function “writeIPAddress()” specified above and replaced every instance of “$_SERVER[‘REMOTE_ADDR’]” in each PHP file where an IP address is either called for or displayed (such as “comment.php” under the wp-includes folder). Let me know how this works for you.
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UPDATE:

I should refine this a bit further … the only file I had to update was comment.php and there was only one place in the code where I replaced the function.