In no particular order:
- Browsers that don’t have rules based cookie managers
- Exchange/Outlook calendar being incompatible with everything else in the ‘verse
- The Voodoo ritual that is Linux + Keepass2-Firefox integration
- Ubuntu system logging defaults
- Virtual hosting services that hobble iptables in the guest
- javascript and the fact that it is everywhere
- When openssh tells you that a host key has been changed, it doesn’t tell you when you last used the key that you are holding. That matters when you tend to re-build systems frequently but continue to use the same IP and hostname.
- The completely half-assed way that Docker IPv6 networking is implemented.