Yes of course this cannot work. change the Banned Name entry

|sTd|, BUZZ

to

\|sTd\|, BUZZ

then it will work! the Banned Name feature uses Regular Expressions.

https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference.

In your case the | is an or opertator which means that it would bann all users that matches

"" or (|) "sTd" or (|) ", BUZZ"

when I try to delete some message from forum, although the message is actually deleted but I receive error messages, as you can see in the image below

https://drive.google.com...U9KOf6qlEvRiqw6C-wls8qdY 

what should i do?

Can you turn off custom errors, and post the full error message the next time this error occurs.

1. Open your web.config file.
   
2. Inside the <system.web> section, change the <customErrors> tag and change the attribute mode to Off
   
3. Save and close the web.config .

Kindly check the attached image. After deleting message, i got this error now. i disable the custom error.

https://drive.google.com...6ff0Le0l2u7sbp5u_pk1iom7