Thunderbird: ‘Connection to server timed out’ error

2 mins
Common issues and questions

In Thunderbird, you may receive a “connection to server timed out” error when sending or receiving a message. Connection timeout errors occur when the server takes too long to respond to a request from your device.

You may be able to prevent this error by increasing the length of time the email client will wait for a response from the server.

How to prevent timeout errors in Thunderbird

1. In Windows, open Thunderbird and go to Tools -> Options -> Advanced -> General -> Config Editor.

1. In Mac, go to Thunderbird -> Preferences -> Advanced -> General -> Config editor… Click to confirm “I accept the risk!”

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2. In the search field, type in mailnews.tcptimeout.

3. Right click on that row and select Modify.

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4. Change the value to a higher number, such as 1000 or 2000.

If you still receive a connection timeout error, there may be something else wrong with your internet connection, your computer, or our servers.

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