Resolved Wrong handling modsecurity in plesk?

[Azurel]

CentOS Linux 7.5.1804 (Core)‬
Product Plesk Onyx Version 17.5.3

I have modsecurity2.9.2-1.el7 and Tools -> Web Application Firewall is set as "Off". So why I get this modsecurity error when modsecurity is not activated?

[:error] ModSecurity: Access denied with code 44 (phase 2). Match of "eq 0" against "MULTIPART_UNMATCHED_BOUNDARY" required. [file "/etc/httpd/conf.d/mod_security.conf"] [line "34"] [id "200003"] [msg "Multipart parser detected a possible unmatched boundary."] [hostname "www.example.com"] [uri "/myupload"] [unique_id "W...w"], referer: https://www.example.com/myupload
[http:error] AH01579: Invalid response status 44, referer: https://www.example.com/myupload

My problem is that hundreds of images can't upload because of MULTIPART_UNMATCHED_BOUNDARY send a 500 error. Is here a solution for this error or I must modsecurity uninstall in plesk components?

 

[IgorG]

Please look at this KB article Modsecurity module is loaded right after the installation in Plesk

 

[Azurel]

Oh, thank you, I will test it.