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Editorial Team
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Asked: 2026-05-30T09:43:07+00:00

When I try to send an email, I receive the following error: Unable to

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When I try to send an email, I receive the following error:

Unable to read data from the transport connection: net_io_connectionclosed.

The email sends when I run it on my local machine but as soon as I upload it to IIS it stops working.

Below is my mail settings in my web.config file:

<system.net>
    <mailSettings>
      <smtp from="">
        <network host="MyEmailServer" port="25" userName="" password=""/>
      </smtp>
    </mailSettings>
  </system.net>

It also seems to work on my server but only sometimes.

Any help would be appreciated, thanks.

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1 Answer

  1. Editorial Team

    I found a fix, could be useful if anyone sees this in the future. Instead of: <network host="MyEmailServer" port="25" userName="" password=""/> I did: <network host="192.168.0.1" port="25" userName="" password=""/> Where 192.168.0.1 is the IP address of the server. Hope it helps

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