WhatsApp cannot establish a connection - what to do?

If WhatsApp cannot establish a connection to the Internet, this is usually due to a faulty connection. We'll show you how to solve the problem.

WhatsApp no longer establishes a connection

Switch the connection between WLAN and the mobile data network. If the problem no longer occurs after the change, it is not due to WhatsApp. You should also force a renewed network search.
Open any website in the browser to test the general connection on the smartphone. If you cannot access any websites, there is a problem with the Internet - and not with WhatsApp.
If you restart the device, errors in the buffer are deleted. In some cases, this can work small miracles.

If you have just installed an update for WhatsApp, the error may also be here. Also check if an update for WhatsApp is available.
Android: Make sure that the "Limit background data" function (accessed via menu key) is not activated under Settings> Data consumption.
If the problem persists, it is probably server problems with WhatsApp. You can find more information about current error messages on the website AlleSt Stör.de.
As a last step, you can delete WhatsApp and then reinstall it. Before doing so, however, you should back up WhatsApp.