The following block in koha-httpd.conf prevents oai.pl from working in a web browser: # Secure internal stuff <DirectoryMatch "__OPAC_WWW_DIR__/.*/(modules|xslt|includes)"> Order deny,allow Deny from all </DirectoryMatch> You get a 403 for /opac-tmpl/xslt/OAI.xslt which prevents the HTML from displaying.
Closing this due to age