Resave permalinks first.
Then show us your .htaccess (and is it for subdomain or subfolder?)
Do any subsites work at all? Not their RSS< just in general.
@ipstenu: I tried ~everything~. I thought the feed issue was big deal, until I noticed all my permalinks were compromised. Posts, Pages, Categories and everything in the middle.
Yes, yes. The “/blog/” slug (network was subfolder), I know, I know… My installation is 5 years old, :x. Disable all plugins, cleaned all the stuff. Even .htaccess (only the specific wordpress code was here), which could have any mod_rewrite. But still, nothing worked.
So, I turn off network feature, “re-install” wordpress and repair database with old backup. Then, all the problems were gone.
But… I guess something was wrong inside the xx_options
table. Because using the table-after-network-stuff-inside I get all error, but table-before-network is OK.
I did try delete some strange rows, but… In time, I didn’t create any sub-site… you can guess why hahahah
I tried ~everything~.
I have to point out that I have no idea what that covers, so you’ll have to bear with us if we ask you do things you don’t explicitly state. It’s just cause we can’t know, and don’t like to assume 🙂
Subfolder network is fine 🙂 A 5 year old network means you were on WPMU before it merged with Multisite, correct?
Double check your .htaccess – http://codex.wordpress.org/Create_A_Network#.htaccess_and_Mod_Rewrite
But … Hrm. That’s weird that the new build is okay, it sounds like a DB corruption.
(…) so you’ll have to bear with us if we ask you do things you don’t explicitly state. It’s just cause we can’t know
Well, that means you need read my entire reply, because I answered what you asked for. Before asking for help I did try all the logical-basic possibilities to resolve the case, but nothing worked.
Disable all plugins, cleaned all the stuff. Even .htaccess (only the specific wordpress code was here), which could have any mod_rewrite. But still, nothing worked.
No. My wordpress installation is 5 years-old (normal), the system doesn’t allow automatic it (subfolder network). “You cannot choose Sub-directory Install (for a path-based network) if your existing WordPress installation has been set up for more than a month, due to issues with existing permalinks.”
No, again. The only thing in .htaccess was the code necessary for network.
No, you get it wrong. The new table doesn’t work, but the old one yes. But nevermind, I reverted to normal install.