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The best way to troubleshoot the issue is to liaise your SMS provider to find out what their logs state, perhaps your campaign instance IP is not whitelisted on their side, also follow the next steps outlined on the acc extended sms configuration guide.
First of all Enable verbose SMPP traces. You will need them to see what is happening when the connection restarts.
Steps to troubleshoot Issue when connecting to the provider
If the BIND PDU returns a non-zero command_status code, ask the provider for more information.
Check that the network is properly configured so the TCP connection can be made to the provider.
Ask the provider to check that they properly added the IPs to the allowlist of the Adobe Campaign instance.
Check External account settings. Ask the provider the value of the fields.
If the connection is successful but unstable, check the Issue with unstable connections section.
If connection issues are difficult to diagnose, a network capture can provide information. Make sure that the network capture runs simultaneously while the problem appears for it can be analyzed efficiently. You should also note the exact time at which the problem appears.