Streamer is a paid Esper service that acts as a proxy server. It handles Esper Agent app download traffic and provides two static IP addresses.
We offer streamer service to accommodate customers uncomfortable with allowing relatively wide-open *.amazonaws.com FQDN.
Streamer is not enabled on every tenant. Contact Esper to enable streamer for your tenant.
Once enabled, you can set up the following firewall rule in place of *.amazonaws.com :
|TCP: 443 (HTTPS)