Travis CI change history: Network Connectivity Errors

Travis CI reported a major incident involving build failures from unsuccessful TLS handshakes to whereami.travis-ci.com:443, affecting Linux, Windows and Mac build processing. It started at 2019-08-08 07:29 UTC and was resolved at 2019-08-08 14:19 UTC, lasting 6 h 50 min. Affected production systems were removed from the pool; all builds were back to normal by 10:52 UTC.