network upgrade failing on ssl only site with self-singed cert

We had the same situation, the solution is:

Create a MU plugin with the following content

<?php
add_filter('https_ssl_verify', '__return_false');
add_filter('https_local_ssl_verify', '__return_false');
?>

and try again. ??

Damn, this works like a charm! I was looking for something like this since I migrated to WP3.0, thanks!

Thanks mastermind, you have just made a lot of people very happy!

I was trying to migrate from Multisite 3.0.x to 3.1.2 and this allowed a successful network upgrade (I was already bracing myself for a blog by blog upgrade).

The only comment I have is that the folder in which Mu plugins resides should be called wp-content/mu-plugins and it may need to be manually created as newer wp versions do not seem to include it.

Yeah, it was included in WordPress MU, but not in the merged version.

Mind, it’ll run in SingleSite as well as MultiSite ;D

Thanks for the useful post, @mastermind, this was helpful!