Error message when editing

When I add content then click Save the following dialog pops up:

Forbidden You do not have permission to access this document. Web Server at

Is there file permission I need to allow or is this a software security issue with my web host?

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trixiemay replied on at Permalink Reply
This happens only when I copy and paste code from one part of the site to another. It doesn't affect just standard text and photo editing.
Mnkras replied on at Permalink Reply
Im guessing you have some server software that is blocking the submission, that error does not come from concrete5, but the webserver (im guessing a security type addon)
trixiemay replied on at Permalink Reply
Yeah I've been in touch with the webhost but awaiting resolution on this.
Just wondered if anyone else using C5 had a similar problem and solution.
mesuva replied on at Permalink Best Answer Reply
I'm pretty certain this is Mod Security kicking in an blocking the submit.

When you speak to your host, ask them to check their Mod Security logs around the time that you know a block happened (it can help to trigger the block just before speaking to them).

If they spot something, just ask them to whitelist the triggered rule.
trixiemay replied on at Permalink Reply
That was it! My newer sites were on a newer PLESK panel with ModSecurity switched on in the firewall settings. Web Host kindly obliged so now I have happy clients!