SSL error when installing Sitecore with ARM templates.

2. March 2018 16:40 by martijn in sitecore, azure

If you have used the Sitecore ARM templates recently to roll out a Sitecore environment your might come accross the following error (I encountered it while trying to deploy a Sitecore 8.2.3 environment):

Failed to download package.\r\nAppGallery Deploy Failed: 'System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel

It took me quite a while to figure out what was going on but after looking on my App Service instance with excellent Kudu tools I got a good hint. In the MSDeploy log there was a error about the following package not being downloaded ""setCompatibilityLevelMsDeployPackage". This package is hosted on Github and the Sitecore ARM template refers to it. However due to security measures on Github ( the download no longer works from Azure.


So how to fix? Just upload the package to your storage account and update the parameters json.

"value": "https://<mijblob><your SAS token>"
Easy fix when you know what's going on :)