I filed the following bug due to the breakage of syntax file updates for KDE3:
Kate syntax highlighting files download fails to download or update syntax files after Certificate mismatch at the upstream site.
Specifically, attempting to update syntax highlight files, as has been available and updated for more than a decade by using:
Now results in a certificate mismatch. Certificate not issued for host IP. You can choose to accept the new certificate forever and proceed to click "Download" to update the syntax files. However, the normal download dialog that flashes and shows each update being downloaded, now only momentarily flashes once and no new syntax files are downloaded. Current updates are not downloaded.
The current syntax files shown needing update are:
ASN.1 Alerts_Incident Bitbake ChangeLog ColdFusion Debian Changelog MIPS Assembler Objective Caml Perl Ruby/Rails/RHTML SQL(Oracle) SQL(PostgresSQL) Scala Scheme Stata Zsh progress reStructuredText
All show prior versions properly installed in Kate, but new updates are not retrieved.