So You Want to Run Azure Functions Using .NET 5

UPDATE 2021/11/09: Since the release of .NET 6 yesterday, there is reportedly day 0 support for .NET 6 across App Services and Azure Functions. Unless you have an absolute requirement to use .NET 5, the solution to using the latest and greatest .NET in Azure is .NET 6! I’ve left the rest of the blog post as it was just in case it helps someone, but I predict that it will become something of a relic now that it’s targeting an older version.

I’ve spent the last couple of evenings trying to get a set of Azure Functions migrated from .NET Core 3.1 to .NET 5 so that I can play around with some of the nice new syntax options, nullable contexts and the like. Since .NET 5 has officially been released, it would be justifiable to believe that it would be well supported across the core Microsoft product catalogue, such as in… say… Azure Functions?

Ha! You’re a funny one.

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Changing Host Key Algorithm in SSH.NET

I’ve used SSH.NET a lot over the years to send and receive files using SFTP and it’s a very flexible and practical library, but the documentation can be a bit thin on the ground when you’re looking to use some of the more esoteric features it has.

As an example, I recently ran into an issue where I was connecting to a remote server and the host fingerprint I was receiving through SSH.NET didn’t match the one that I expected to see (and could see in WinSCP). After verifying that I was using the same connection settings on both and more than a little spelunking through the SSH.NET source code I found that by default the host key algorithms used by the stable release of SSH.NET that I was on (2016.1.0) are RSA and DSA, while WinSCP uses Ed25519. For my purposes I needed to use Ed25519 in SSH.NET as well even though the SFTP host also supported these other algorithms.

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