Tuesday, May 19, 2015

Troubleshoot Exchange Server Error 431, 432, 441, 442, 446, 447, 449

Exchange Server is a brilliant SMTP Server program developed by Microsoft that operates on Windows Server. It is an email and collaboration Server which is a part of ‘Microsoft Server line of products’. Although, Exchange Server is integrated with various advance features yet there are some limitations imposed on it that leads to the generation of Exchange Server errors. Exchange Server error 431, 432, 441, 442, 446, 447, 449 are some common error codes generated by various versions of Exchange Server. The blog deals with the cause of some common error messages and their resolutions.

Exchange Server Error And Reply Codes

SMTP Servers produce very cryptic reply codes that are difficult for users to understand. It must be noted that all reply codes produced by Exchange Server are not error messages. Many a times, the reply codes consist of details related to the Server or response of some commands.

Any code related to Exchange Server consists of three digits that deliver a unique message to the users. The first digit of the code describes whether a command is accepted by Exchange Server, an action is completed, some temporary issues are faced or errors are encountered by Exchange Server. The second and third digit describes whether there are syntactic issues or some connection problems.

It becomes easier to deal with Exchange Server errors if you properly understand the cause and solution of the issues. Some popular 4’s series of Exchange Server errors are discussed in the upcoming section of the blog.

Exchange Server Error 431

In Exchange Server 2007, there may be scenarios when the processing of mail by Exchange Server is stopped and errors are logged due to low free disk space. In such cases two identities are encountered event ID 15002 or 15003 and 4.3.1 Insufficient System Resources. You can overcome from such situation by following ways:

  • Increasing disk space of the local machine
  • Disabling backup pressure feature

Exchange Server Error 432

When you try to process a huge amount of emails via SMTP gateway, the large volume of mail causes Exchange Server to face resource issue. In such cases the following error message is displayed

"432 4.3.2 Storedrv.Deliver; recipient thread limit exceeded"

In order to troubleshoot this issue, you need to throttle Exchange so that you can use more resources before reaching a threshold level. In order to modify throttling parameters, the following steps needs to be followed:

  • Navigate to the following location
"C:\Program Files\Microsoft\Exchange Server\V14\Bin"

  • Open the file named edgetransport.exe.cofig.
  • Insert the following entries

          > add key="RecipientThreadLimit" value="2"/
          > add key="MaxMailboxDeliveryPerMdbConnections" value="3" /

On following the above mentioned steps, you can easily modify the throttling parameters of Exchange Server which in turns permits you to process a greater amount of emails through SMTP gateway.

Exchange Server Error 441

Exchange Server Error 441 or 4.4.1 is a message generated by Exchange Server notifying users that the addressee server is not responding. This error message is generated by the sender’s Server. There is no fixed method to overcome from this issue. The only solution in this case is to send the message until the recipient Server comes in a stable state and receives the mail. The process is time consuming and there no fixed defined attempts.

However, for the convenience of the users SMTP Server had made this process automated. The sender’s Server tries to send the mail again and again. The number of times the process continues totally depends on the configuration of the sender’s Server.

Exchange Server Error 442

Exchange Server Error 442 is caused due to network issues or downtime of Exchange Server. In such cases Exchange Server delivers the following error message

"Secured VPN connection terminated locally by the client
Reason 442: Failed to enable Virtual adapter"

When an Exchange Server delivers a message but during the transmission the connection gets broken, as a result of it, you could not deliver messages. This can be a transient error but if the issue continues further, you need to analyze your network devices like routers, network card etc.

In order to secure users from adverse condition, the Server tries to resend the message for a definite time period and generates status report for the convenience of the users.

Exchange Server Error 446

Before reaching to the destination, certain numbers of hops for a particular message is fixed by the user. If the message increases the maximum limit of hop that was fixed by the user during its transmission then Exchange Server error 446 is encountered. This scenario may occur when there is a loop situation between the receiving Server and sending Server which are not a part of the same organization. In this case the message oscillates till the maximum hop count is exceeded.

You can secure yourself from such conditions by simply checking some situations that responsible for the creation of loops between Servers or you can override the settings of Exchange Server manually.

NOTE: By default, the maximum hop count for Exchange Server 2000 is 15 and that of Exchange Server 2003 is 30.

Exchange Server Error 447

If the outgoing message is timed out Exchange Server error 447 is encountered. The main reason for the generation of this error message is issues with receiving Server that hurdles the message sent by Exchange Server. This issue arises if there are a number of recipients of a particular message or is problem with message header. In most of the cases, time out of the protocol between the communicating and remote server is the main issue of this error.

Exchange Server error 447 is caused due to issue with the receiving Server. In order to secure yourself from such issues verify that the recipient addresses are correct and the remote server is configured properly to receive the messages. You need to keep the number of recipient limited and resend the message. On resending the message will align itself in the queue and will be delivered as soon as the receiving Server comes in online mode.

Exchange Server Error 449

In case there is bad routing configuration or some temporary routing issues, users may encounter Exchange Server Error 449. This issue may take place in either one or the mentioned scenarios:

  • A message is sent to a receiver who was a member of routing group which got deleted
  • Configuration of SMTP connector is done to use DNS without smart host. Further, configuration is made to use non SMTP address space.

If you encounter this error, you can make use of in built tool developed by Microsoft called WinRoute.


It is a common scenario to face Exchange Server error messages. If you find yourself trapped between these error messages then there is no need to panic. Just hold your nerve, you can get rids of them easily. This blog provides techniques to troubleshoot some basic error messages displayed by Exchange Server.


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