In such scenario, below points to be verified by admin from SMPP user.

  1. Confirm if Client is able to telnet SMPP Server and Port.
  2. Confirm if Client is blacklisted on network level.
  3. What error code is received on Bind response on Live PDU capture.

Once the admin is available with the above details, feel free to reach iTextPro Support team for further assistance.

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