Can't sign in to Skype for Business

If you did not use Skype for Business for a longer period of time, its cache can become corrupted and you may be unable to sign in. You may see an error message such as: "Server temporarily unavailable" or "Can't sign in to Skype for Business. Username, password or domain appears to be incorrect."

The solution is to delete the Skype for Business cache.

1. Make sure Skype for Business is completely closed. Right-click on Skype for Business icon in Windows sytem Tray and select Exit.

2. Click on Wondows Start button and select Run (or push Windows Key + R) and type %localappdata% and hit enter. That will launch Windows File Explorer and bring you to C:\Users\<userid>\appdata\local\ folder.

3. To clear SIP cache you need to delete the following three folders:
located in \Appdata\Local\Microsoft\Office\16.0\Lync\

located in \Appdata\Roaming\Microsoft\Office\16.0\

located in \Appdata\Roaming\Microsoft\Crypto\

4. Open the registry editor by clicking on Start> Run > type regedit and hit enter, or Windows Key + R, type regedit and hit enter.

5. Navigate to HKEY_CURRENT USER-> Software -> Microsoft->Office->16.0->Lync->Delete the entire folder

6. Restart Skype for Business and sign in.

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Article ID: 22643
Mon 1/9/17 4:28 PM
Sat 9/30/17 9:41 AM