403 Forbidden error when doing advanced search or when the booklist shows after logging in while accessing search pages through internet, but everything works fine through the intranet. what could be the issue?
Just sharing the url https://koha24.kis.in/cgi-bin/koha/opac-search.pl?advsearch=1&idx=kw&q=fish&do=Search&limit=branch%3AHS&sort_by=title_az Forbidden You don't have permission to access this resource.
Did you make any changes to the Apache files for example? I don't think that this error is coming from Koha directly. You might want to try asking in the chat (https://chat.koha-community.org) instead, as I suspect this is more likely to be a setup issue. Did you update and did it work before or is this a new installation?
I think that this is quite clearly a misconfiguration of Apache.