RemoteApp connection fails on Windows 7 and 8

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Overview

When connecting to RemoteApps from Windows 7 or Windows 8 machines, users may be prompted with an error message and blocked from establishing a working connection with the remote server. Generally, the error message is similar to "The connection cannot continue because the identity of the remote computer cannot be verified".

This issue is caused by the Network Level Authentication (NLA) protocol on the user's machine. NLA is useful if your organization has an internal Certificate Authority and auto-enrollment configured. Otherwise, it needs to be properly configured to allow the remote connections to go through.

Resolution

Follow the steps below to configure NLA on the user's machine.

  1. Go to Start -> Run and launch gpedit.msc.
  2. In the Group Policy Editor, go to Computer Configuration -> Windows Settings -> Security Settings -> Local Policy -> Security Options.
  3. Find the Network security: LAN Manager authentication level key and double click it.
  4. Set its value to Send NTLMV2 response only.
  5. Close the Group Policy Editor.

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Once you configure this setting, you should be apple to connect to RemoteApps normally.

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