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Known issues & workarounds

Preview 2 tooling known issues

OpenSSL dependency on OS X

OS X "El Capitan" (10.11) comes with 0.9.8 version of OpenSSL. .NET Core depends on versions >= 1.0.1 of OpenSSL. You can update the version by using Homebrew, MacPorts or manually. The important bit is that you need to have the required OpenSSL version on the path when you work with .NET Core.

With Homebrew, you can run the following commands to get this done:

brew update
brew install openssl

Homebrew may also show the following warning:

Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

This warning is meant for the software that uses OpenSSL (in this case, .NET Core) and not for the end-user that is installing said software. Homebrew installation doesn't touch either the existing Apple crypto libraries or existing OpenSSL 0.9.8 version, so there is no impact on any software that uses either one of those crypto solutions and is already installed.

MacPorts doesn't have the concept of linking, so it is recommended that you uninstall 0.9.8 version of OpenSSL using the following command:

sudo port upgrade openssl
sudo port -f uninstall openssl @0.9.8

You can verify whether you have the right version using the openssl version command from the Terminal.

brew refusing to link openssl

Warning: Refusing to link: openssl
Linking keg-only OpenSSL means you may end up linking against the insecure,
deprecated system version while using the headers from the Homebrew version.
Instead, pass the full include/library paths to your compiler e.g.:
  -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib

This is due to a recent update from brew where it refuses to link openssl. The installation steps have been updated with instructions on how to deal with this.

Users of zsh (z shell) don't get dotnet on the path after install

There is a known issue in oh-my-zsh installer that interferes with how path_helper works on OS X systems. In short, the said installer creates a .zshrc file which contains the exploded path at the time of installation. This clobbers any dynamically generated path, such as the one generated by path_helper.

There is an outstanding PR on the oh-my-zsh repo for this.

Workaround 1: symlink the dotnet binary in the installation directory to a place in the global path, e.g. /usr/local/bin. The command you can use is:

ln -s /usr/local/share/dotnet/dotnet /usr/local/bin

Workaround 2: edit your .zshrc and/or .zshprofile files to add the /usr/local/share/dotnet to the $PATH.

app.config file needs to be checked out before publishing

If you have an app.config file in source control that places locks on local files (such as TFS), you will receive the following error during publishing:

Failed to make the following project runnable: <project name> reason: Access to the path <path> is denied.

To resolve this, checkout the app.config file from the source control prior to publishing.

dotnet commands in the root of the file system fails

If you run any dotnet command on project and code files that reside in the root of the file system (/ in Linux/macOS or C:\ in Windows) it may fail due to security reasons. The most common error that is encountered is:

Object reference not set to an instance of an object.

This affects the situation where the actual code files are in the root. So, the example path that would trigger this behavior would be /project.json or C:\project.json on UNIX or Windows respectively.

Workaround: use a directory to store your projects and source files.

More information:

On dev builds of the tools, restoring default project from dotnet new fails

When using non-release versions of the CLI, dotnet restore will fail to restore Microsoft.NETCore.App because for that particular version it exists on a NuGet feed that is not configured on the machine. This behavior is by design and does not happen with public releases (such as RC2).

Workaround: create a NuGet.config file in the project directory which contains the following:

<?xml version="1.0" encoding="utf-8"?>
    <!--To inherit the global NuGet package sources remove the <clear/> line below -->
    <clear />
    <add key="dotnet-core" value="" />
    <add key="" value="" />

Running dotnet on Debian distributions causes a segmentation fault

If a Debian machine is set in a certain way it may cause the native host (dotnet) to produce a segmentation fault. The culprit is the failed installation of the libicu dependency due to mirror package repository setup. If you fail to set up mirror package repositories, apt-get may not be able to resolve the dependency and the host will fail at runtime.

Affects: the native host

Workaround: make sure that all of the native pre-requisites are installed correctly. You can usually do this by running apt-get package manager.

Uninstalling/reinstalling the PKG on OS X

OS X doesn't really have an uninstall capacity for PKGs like Windows has for MSIs. There is, however, a way to remove the bits as well as the "recipe" for dotnet. More information can be found on this SuperUser question.

Preview 3 tooling known issues

Installing VS 2017 RC or dotnet CLI preview3 prevents Visual Studio 2015 .NET Core tooling from working

Symptoms: Opening a project.json solution in Visual Studio 2015 fails with error: Error reading '{some root path}\.vs\restore.dg'


  • Copy the full command line that is failing, something like C:\Program Files\dotnet\dotnet.exe restore "C:\Users\user\Desktop\SampleApp.vs\restore.dg"
  • Open a command prompt and navigate to the project directory, e.g. cd C:\Users\user\Desktop\SampleApp\
  • Run the copied command from this directory
  • Reload the project in Visual Studio

Restore required before using the .NET Core tooling Preview 3

You have to run dotnet restore before you try any of the CLI commands in the Preview 3 tooling. The restore call is needed to bring in the needed targets that comprise main functionality of the Preview 3 tooling. You will get the following error if you don't restore on macOS/Linux machines:

/usr/local/share/dotnet/sdk/1.0.0-preview3-004056/Microsoft.Common.CurrentVersion.targets(1107,5): error MSB3644: The reference assemblies for framework ".NETFramework,Version=v4.0" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.

If you don't get this error on a Windows machine, that is most likely due to the fact that the targeting pack for .NET Framework 4.0 are installed. To be sure that you have the targets, run restore again if you are not sure.

dotnet test has changed from Preview 2 dotnet test

As part of the overall Preview 3 work, dotnet test command has been been revised and is quite different in usage and behavior then Preview 2 dotnet test command. Please consult the official dotnet test docs for more information and expect more documentation in coming days.

What is this document about?

This document outlines the known issues and workarounds for the current state of the CLI tools. Issues will also have a workaround and affects sections if necessary. You can use this page to get information and get unblocked.

What is a "known issue"?

A "known issue" is a major issue that block users in doing their everyday tasks and that affect all or most of the commands in the CLI tools. If you want to report or see minor issues, you can use the issues list.