Unexpected Rule?

Access denied with code 403 (phase 2). Found 30 byte(s) in ARGS:comment outside range: 1-255. [file “/var/cpanel/cwaf/rules/cwaf_01.conf”] [line “319”] [id “210410”] [msg “COMODO WAF: Invalid character in request”] [severity “ERROR”]

http://www.seoindiaconsultant.com/wp-comments-post.php HTTP/1.0

Comment can be of n number of characters. why limiting it? Or i am missing something? Plz explain

This rule blocks requests with Null Bytes. This is an unusual usage. You can disable this rule if you need to bypass it.