We have run into some NAT issue behind a firewall. When double firewalls exist, expressway edge sends the traffic through one firewall and get into another firewall to reach the client. That destination client is NATed behind firewall. Somehow firewall starts dropping one direction UDP packets and then it comes back after a while. Then it could go away again. This only happens to one direction. When checking the firewall, it appears the firewall drops the packets due to the default rule when there is initiation connection towards to the public IP of firewall, it drops by default. But when expressway edge starts sending packets to the private IP again, then the audio packets go through. Somehow expressway edge sends the packets to private IP behind firewall and sometime it sends to public IP of that firewall. I wonder if this is related to STUN configuration on both expressway edge and Jabber client itself.
IntroductionThe IssueServices Shown their status as UnknownWhat actions require to be taken?Logs required for troubleshootingWhat to expect in the logs:
The purpose of this document is to provide troubleshooting insight into a well-known iss...
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