403 error on updating multisite network plugins

[wkowalski]

I'm experiencing a 403 error when trying to update the settings on two different plugins, both of which are built by WPMU Dev and which are running network-wide on my multisite. One of them is Pro Sites and the other is Advertising. Both control the same feature, which is the use of Google ad code that appears on subsites throughout the network. I am using both Wordfence and Sucuri security plugins and have disabled them both, but the error persists. The server owner does not believe there is anything in the configuration that should be causing this. The plugin permissions are all set to 755. I do not seem to be having this problem with any other plugins--only these two. Is this a server-related issue? What settings on the owner's account would be responsible for denying certain plugins permission to update, if any?

 

[wanah]

Could this be a false positive from a modsecurity rule ?
Try adding provisionaly to your website's .htacess file :

<IfModule mod_security.c>
  SecFilterEngine Off
  SecFilterScanPOST Off
</IfModule>

Or ask your sys admin to check if it is mod security and if it is to disable the rule that causes the false positive.

 

[Long]

Right, good point from wanah worth trying