Have upgraded to latest version, since it's first day of release.
Recently only noted a member's site was giving "Database Error" and shows "Error establishing a database connection" when access, but yet others under same WPMS is still working flawlessly.
Checked every part and found there is a fail during perform Network Upgrade. Whenever reached to the batch of this member belongs, it stopped and show message:
Warning! Problem updating . Your server may not be able to connect to sites running on it. Error message: A valid URL was not provided.
I really don't have idea where should I fix. Hopefully can have somebody here can give me a guide.