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Error in event log: "smtp parse cmd error with code -1"



Article ID: KB10080 KB Last Updated: 23 Aug 2010Version: 3.0
The following error may be reported in the event log: "smtp parse cmd error with code -1"


  • The following error is reported in the event log: "smtp parse cmd error with code -1"

Below are reasons for the "smtp parse cmd error with code -1" error message:

1.  Both Anti-Virus and Anti-Spam use the same SMTP parser to validate SMTP traffic at the application level. If the firewall sees a SMTP command that is not supported, the error "smtp parse cmd error with code -1" will be logged and the packet corresponding to this message is dropped by the firewall.

2.  Currently, Extended SMTP (ESMTP) is not supported. As such, ESMTP commands such as BDAT and XEXCH50 will result in the error and dropped packets.

The SMTP parser on Juniper firewalls only supports the following commands:


Any other commands sent by either the SMTP server or client will generate the above parser error in the event log and be dropped by the firewall.

1) In order to avoid the parser error, disable any unsupported SMTP commands on either the server or the client.

2) If ESMTP is the cause of the messages, upgrade to ScreenOS 5.4.0r8 (and later) and 6.1.0r1 (and later).  These versions will prevent packets from being dropped by filtering out ESMTP commands from the capacity list in EHLO (Extended Hello) server reply messages. 

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