• TLS
• HTTP
• https
• SSL

check_https_go

Icinga/Nagios plugin, checks that a site returns a 2xx-series `status code`, `returns content`, and has a `valid certificate`.

• TLS
• DANE
• DNSSEC
• gpl-3.0
• gplv3
• SSL
• TLSA

check_dane

Nagios/Icinga plugin for checking DANE/TLSA records

• TLS
• gpl-2.0
• gplv2
• Linux
• Network
• OCSP
• SSL
• Stapling

check_ocsp_stapling

Nagios/Icinga plugin for monitoring stapled OCSP responses

• TLS
• Cert
• Certificate
• Plugin
• SSL

check_certexp

• TLS
• certificates

check-transparency-logs

Retrieve server certificate data from transparency logs or APIs and compare it to certs we know we have.

• TLS
• Network
• traceroute

check-machine-in-the-middle

Icinga/Nagios and stand-alone check scripts for the heuristic testing of machine-in-the-middle situations.