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Although Skype offers to set the correct date and time too, in fact, the error can occur for two different reasons:

• Skype For Business Certificate Error Clock Settings Mac Free
• Skype For Business Certificate Error Clock Settings Mac Os

(This certificate must have a subject name or subject alternative name that identifies the user and must be issued by a Root CA that is trusted by servers running Skype for Business Server, be within the certificate's validity period, and not have been revoked.) To be authenticated, users only need to type in a personal identification number (PIN). Please note: Skype for Business is currently available only to UO employees. Skype for business caches files locally on your PC or Mac to pull information quickly and efficiently. Sometimes you may need to clear your cache to resolve specific issues. This article explains how to clear your cache on your PC or Mac.

• Incorrect date and time settings
  To set the correct date and time on the computer:
  1. Open the “Control Panel” of the computer.
  2. Switch to Classic View (i.e., the icons view).
  3. Open the “Date & Time”, put the correct time zone and enable “Automatically adjust clock for Daylight Saving Time”.
  4. After this, open the tab “Internet Time” (if you have Windows 7, click “Change settings”).
  5. Enable the option “Automatically synchronize with an Internet time server”.
  6. Select “time.windows.com” server and click “Update now”.
  7. As a result, after a few seconds the inscription “Time was successfully synchronized 15/10/2016 at 22:46 from time.windows.com” must appear.
  8. Restart Skype and check if the error has disappeared.
  
  
• Problems of Root Certificates
  As a rule, if you haven’t set the latest root certificates, the error “Content is blocked because it is not signed by a valid security certificate” also can appear on Skype. To solve the error:
  1. Download the file rootsupd.exe
  2. Run the installer of root certificates (if something went wrong, see below how to install root certificates manually).
  3. Restart Skype and check if the error has disappeared.

If the instruction has helped you to solve the error, write in the comments, it is desirable to specify the Skype version and operating system, in order to know exactly, for what computers this manual is suitable. Of course, any advice to improve this article is welcomed.

Skype For Business Certificate Error Clock Settings Mac Free

How to install root certificates manually

1. Save the file rootsupd.exe (the main thing, not on the system drive). For example, I have saved it on the E: drive in the folder Roots. The full path is E:roots, and this is the way used in the following commands (if necessary, change the E:roots for the desired way).
   
2. Run command prompt with administrator privileges
   
3. Execute the following commands (copy them one by one and press Enter):
   cd /d E:roots
rootsupd.exe /c /t:E:roots
updroots.exe authroots.sst
updroots.exe updroots.sst
updroots.exe -l roots.sst
updroots.exe -d delroots.sst

Attention!

If you have failed to correct the error with the help of these instructions:

Skype For Business Certificate Error Clock Settings Mac Os

1. In Internet Explorer, open the page Check access to Skype.
2. Click “Check” and after the test is completed, copy the link to the result.
3. Leave a comment on this page, with the link and the version of Skype.