Between about 2:34 PM and 3:51 PM ET US, there looked to have been a partial networking outage related to WebTitan / SpamTitan servers in AWS Region us-east-2 (Ohio).
[RESOLVED] Internet Connectivity
[01:06 PM PST] Between 11:34 AM and 12:51 PM PST, customers experienced Internet connectivity issues for some networks to and from the US-EAST-2 Region. Connectivity between instances within the Region, in between Regions, and Direct Connect connectivity were not impacted by this issue. The issue has been resolved and connectivity has been fully restored.