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I had that on one of my sites recently (set to auto update core, so not sure if on 3.9 or one of 3.8.*). Flushing cache fixed it — wp cache flush via wp-cli, I imagine other ways would work just as well.


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I am using Wordpress 3.8.1 and I changed line 67 of wp-admin/network/upgrade.php and added , 'sslverify' => false like this: --- a/wp-admin/network/upgrade.php 2014-03-29 14:31:28.081943490 +0100 +++ b/wp-admin/network/upgrade.php 2014-03-29 14:30:52.785947460 +0100 @@ -64,7 +64,7 @@ $upgrade_url = admin_url( ...



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