Word make Content Block Error

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When I save a Content Block, I got this Error :
Forbidden You don't have permission to access /index.php/ccm/system/dialogs/page/add_block/submit on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

After along research, I found that the word 'tidsepoker' causing it. I also try to put 'poker', also output that error.
Anyone can explain what's happened ?

C5 version : 5.7.4.2

goesredy
 
MrKDilkington replied on at Permalink Reply
MrKDilkington
Hi goesredy,

Just to clarify, you are saying that the words "tidsepoker" and "poker" are causing the error?

Entering them into the Content block is the problem?
goesredy replied on at Permalink Reply 1 Attachment
goesredy
Yes, I got that message when entering text contain 'poker' to Content Block, don't know what is happening.

I've been attach a video to explain what problem is.
MrKDilkington replied on at Permalink Reply
MrKDilkington
There are no problems as long as you don't use those two words?

That is very strange.
goesredy replied on at Permalink Reply
goesredy
Yes, remove those words, everything working.
mesuva replied on at Permalink Best Answer Reply
mesuva
This sounds like Mod Security is kicking in on your server. When you suddenly get 404 pages when posting content in a CMS, 99% of the time it's modsec.

Sometimes certain words when posted to a website will trigger Mod Security, especially when the words are a bit 'spammy'.

You may need to investigate either turning off Mod Security temporarily on your server while making this edits, or asking your server to check the Mod Security logs and whitelisting the rule that is being triggered.
goesredy replied on at Permalink Reply
goesredy
Thanks! :) That was the root of problem.