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@@ -13,3 +13,25 @@ in your pull request.
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While we have not currently run into the need to have multiple
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simultaneous Mono installations, it is [possible](http://www.mono-project.com/docs/compiling-mono/parallel-mono-environments/)
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+
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+# Debugging Mono + NuGet
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+
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+Mono understands an environment variable `MONO_LOG_LEVEL=debug` that is helpful for checking that
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+mono is properly working e.g. loading necessary DLL's.
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+
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+Most NuGet commands understand a `-Verbosity` flag, which is great because the error messages can be completely
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+mystifying when working with Mono too. Use this would enable all the debugging you can:
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+
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+ $ MONO_LOG_LEVEL=debug mono NuGet2.exe update -Verbosity "detailed" -self
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+
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+For example, aspnet was constantly failing with this message:
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+
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+ Could not connect to the feed specified at 'https://www.nuget.org/api/v2/'. Please verify that the package source (located in the Package Manager Settings) is valid and ensure your network connectivity.`.
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+
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+Using `-Verbosity "detailed"` shows that the real error is actually a Mono library problem, as so:
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+
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+ System.InvalidOperationException: Could not connect to the feed specified at 'https://www.nuget.org/api/v2/'. Please verify that the package source (located in the Package Manager Settings) is valid and ensure your network connectivity. ---> System.Net.WebException: libMonoPosixHelper.so ---> System.DllNotFoundException: libMonoPosixHelper.so
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+ at (wrapper managed-to-native) System.IO.Compression.DeflateStreamNative:CreateZStream (System.IO.Compression.CompressionMode,bool,System.IO.Compression.DeflateStreamNative/UnmanagedReadOrWrite,intptr)
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+ <snip>
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+
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+More helpful info is [here](http://www.mono-project.com/docs/advanced/pinvoke/dllnotfoundexception/), [here](http://docs.nuget.org/docs/reference/command-line-reference)
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Hamilton Turner