Last year our upstream provider broke TCP (they upgraded a router/firewall box and it wasn't supposed to affect us, but it dropped asymetrically routed TCP traf

Last year our upstream provider broke TCP (they upgraded a router/firewall box and it wasn't supposed to affect us, but it dropped asymetrically routed TCP traffic) but UDP packets still got out, and thanks to seeing UDP syslog traffic making it out helped us diagnose the issue. Using the "more reliable TCP method" (rsyslogd supports this) would have made the issue harder to track down.