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Reasons for receiving a Connection died error message

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Article ID: 161142

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Updated On:

Products

Email Security.cloud

Issue/Introduction

There are various reasons you might receive an error such as:

Connected to <IP address> but connection died
Connected to <IP address> but connection died. Possible duplicate! (#4.4.2)

Resolution

 

Symptoms:
·         Delayed mail
·         Mails stuck in the retry state
Possible Causes:
1.       The firewall is dropping the connection.
 If you use a CISCO PIX/ASA firewall, check ESMTP Inspect and disable this feature. You can identify if this feature is enabled by seeing if the 220 Banner is masked when connecting to server via telnet session as seen below.
 
220*******************************************************0*2******0***********************
 
References:
 
               
2.       The recipient server is overloaded due to:
·         The bandwidth limits have been reached.
·         Being unable to handle concurrent connects, which is resulting in dropped connections

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