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2656124 - XS609. 450 4.7.1 Client host rejected: cannot find your hostname

Symptom

  • Messages (Email, SMS, etc.) being transferred via SMTP are failing with error message XS609 - Currently no delivery to RECIPIENTEMAILADDRESS, as recipient cannot be reached.
  • The long text of the error message shows 450 4.7.1 Client host rejected: cannot find your hostname, [IP Address]

    SOST error.png

  • In the ICM trace (KBA 2351619) the follow is seen: SMTP PlugInHandleNetData: reply = 450 4.7.1 Client host rejected: cannot find your hostname, [IP Address]
  • The SAPconnect trace (KBA 1639935) shows the following:

    0103 MAP_SMTP_RESPONSE        |     |SMTP Response:                                                                 
    0103 MAP_SMTP_RESPONSE        |     |N RECIPIENTEMAILADDRESS C450 M450 4.7.1 Client host rejected: cannot find yo
    0103 MAP_SMTP_RESPONSE        |     |ur hostname, [IP Address]

 

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."


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Environment

  • SAP NetWeaver
  • Release Independent

Keywords

450 4.7.1, , KBA , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , Problem

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