I have a multi-wordpress installation (3.x) with 5 sites and only one of them is using SSL.
Still, this seems to break wordpress upgrades.
Now I get a message:
Warning! Problem updating https://nonsecureddomain.com. Your server may not be able to connect to sites running on it. Error message: SSL: no alternative certificate subject name matches target host name 'nonsecureddomain.com'
It seems that at some point WP decides to go HTTPS for this domain, where it is not supposed to.
The network itself is the one running on HTTPS(SSL), and what concerns me is that
Is listing the site with a hardcoded HTTPS prefix which seems to to be configurable?