День добрый.

Когда на странице http://***.***.***/cgi-bin/cachemgr.cgi нажимаешь кнопку "Continue..."

Появляется:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

В логах apache2:
[cgid:error] [pid 5155] [client *******] malformed header from script 'cachemgr.cgi': Bad header: </UL>, referer: http://***.***.***/cgi-bin/cachemgr.cgi

apache2 - Apache/2.4.25 (Debian)
squid3 - Version 3.5.23