Microsoft .net 4.7 and Skype for Business Server


During last few weeks, there was lot of confusion going on whether the .net 4.7 is compatible with Skype for Business. When the .net 4.6 was released, it effected the Skype for Business web component which resulted in causing issues with online meetings. Then, there was few bug fixes came up to remedy the situation.

But, Exchange team was first to confirm that the new .net 4.7 is not compatible with Exchange 2013\2016 platforms. But, there were no official recommendation from Microsoft, with regards to the compatibility with Skype for Business.

Few days ago, Microsoft have advised to follow the guidelines that put in by Exchange team, with regards to the compatibility between .net 4.7 and Skype for Business. So the bottom line is, it’s not supported with Skype for Business. If the automatic updates enabled in Skype for Business servers (they definitely should not), use the below method to block the .net updates form being applied

  1. Back up the registry.
  2. Start Registry Editor. To do this, click Start, type regedit in the Start Search box, and then press Enter.
  3. Locate and click the following subkey:
    HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup\NDP
  4. After you select this subkey, point to New on the Edit menu, and then click Key.
  5. Type WU, and then press Enter.
  6. Right-click WU, point to New, and then click DWORD Value.
  7. Type BlockNetFramework47, and then press Enter.
  8. Right-click BlockNetFramework47, and then click Modify.
  9. In the Value data box, type 1, and then click OK.
  10. On the File menu, click Exit to exit Registry Editor.

If the update is already applied, use the guidelines that was put in by Exchange team to uninstall the update and repair the .net 4.6.x version on all servers.

I hope this helps 🙂

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