SmarterMail Timing Out when Uploading or Downloading Large Attachments

Applies to SmarterMail 8.x - 14.x

There are times when a timeout message appears when a user tries to upload or download an attachment using the SmarterMail web interface.

Follow these steps to resolve this issue:

  1. Log into your SmarterMail server.
  2. Open the web.config file with Notepad, located in the c:\program files\smartertools\smartermail\mrs folder.
  3. Search for the line
    <httpruntime maxrequestlength="10240">.</httpruntime>
  4. Replace it with
    <httpruntime executiontimeout="300" maxrequestlength="10240">.</httpruntime>
  5. Save the file.
  6. Stop and restart the SmarterMail service.


Learn more about SmarterMail's enterprise email features and benefits.


executiontimeout is case sensitive should be executionTimeout with a capital "T"

Also you will need to edit this file each time you do an upgrade of SmarterMail.

Errors clients receive using IE, FireFox or Chrome are "Your connection has been reset", and Network Error, also once in a while just says timeout.

Error in SmarterMail Log is : System.Exception: Null exception (likely a 404 or something else produced by IIS)

Default Timeout is 1 min 50 seconds, use this KB to increase the default.

David Fisher (2/17/2015 at 10:23 AM)