The upstream infrastructure provider deployed a fix and resolved the issue.

We continue to work with our upstream infrastructure provider to fix this issue. We apologize for any disruption.

Since 14:00 UTC, the Viber agent builder, agent preview, and new agent setup may not respond or may time out. Deployed agents keep replying, though a small share of messages may be slower or fail. We've traced this to an issue with an upstream infrastructure provider and are working with them on a fix.