Home > Uncategorized > Xbap (ClickOnce): The underlying connection was closed: An unexpected error occurred on a send

Xbap (ClickOnce): The underlying connection was closed: An unexpected error occurred on a send


Last week after deploying to one of one of the internal environments, we got the following error on the installation of an xbap application

An exception occurred while downloading the manifest. Following failure messages were detected:

+ Downloading https://<url>/app.xbap did not succeed.

+ The underlying connection was closed: An unexpected error occurred on a send.

+ Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

+ An existing connection was forcibly closed by the remote host

It turned out that the IT group had disabled TLS 1.0 and 1.1. After enabling those protocols, the xbap was operating as expected

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