Skype for Business Certificate Expiration Issue - The Skype for Business Server Front-End service terminated with the following service-specific error:

 

Unable to start “Skype for Business Server Front-End service”

Event viewer:

The Skype for Business Server Front-End service terminated with the following service-specific error:
A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.

Note: Before requesting a new certificate, we need to make sure that the Root CA certificate is installed in the Trusted Root Certification Authorities under the Local Computer Certificate Store:

Also please review the expired cert before starting the wizard so that you have necessary information request in the wizards, Example shows the SANs used my cert.

Step 1 – Login to SFB Server which the cert is expired.

Open Skype for Business 2015 – Deployment Wizard and click on Install or Update SFBS Systems

Click on Request, Install or Assign Certificates >> Run

you will see exclamation marks as shown below if the cert is not valid (in our case expired)

Click on Request button, it will bring  Certificate Request window, You’ll need to fill the form. It is very important to select ALL or domain for subject alternative names (My case I use my domain) Click for advance if you need to do some custom settings like ;

Create an Offline Request, Specify another CA, Specify different CA credentials, Use a different Certificate Template, Change key bit length and/or Mark the certificate private key as exportable and Add additional SAN names. After that, we will return to the initial Certificate Request screen

Review the summery if all good click on Next.

If the certificate request is successful, we get Task status: Completed:, for more information you can view the view log.

This will open the Certificate Assign wizard click on Finish

Before assignment check and validate the cert by View Certificate Details

Click on Next

If the certificate assignment successful you see tick marks as below.

Congratulation ! now you have reconfigured the cert successfully, recommend a server restart but not mandatory now you can start services manually

@roshan-

Switching between the Skype for Business and the Lync 2013 client user interfaces

Edit Registry Binary Value for switching between Skype for Business and the Lync 2013.

Open windows Registry
Start >> Run >> regedit >>
Navigate to Registry key [HKEY_CURRENT_USER\Software\Microsoft\Office\Lync]
The key should look like the following:
"CanSharePptInCollab"=dword:00000001
"CanShareOneNoteInCollab"=dword:00000001
"CanAppShareInCollab"=dword:00000001
"EnableSkypeUI"=hex:00,00,00,00
Double click to open the key and edit last binary digit
The Value name must be EnableSkypeUI   , and the Value data must be set to 00 00 00 00  - For Lync.
The Value name must be EnableSkypeUI   , and the Value data must be set to 00 00 00 01 - For Skype for Business.
If you do not see the EnableSkypeUI key after installing the Skype for Business update you will need to create the Key.

NOTE: Please note that this behavior will be affected by how your Client Access Policy Configuration.
Grant-CsClientPolicy –PolicyName ClientPolicyEnableSkypeUI - The user will continue using the Skype for Business client user interface.
Grant-CsClientPolicy –PolicyName ClientPolicyDisableSkypeUI - The user will be asked to switch to the Skype for Business (Lync) client user interface. They can switch later.

-Thanks
@ Roshan

LYNC Click to CALL, Lync Add-on, Lync Call, Lync Call using IE

What is Click to Call?

Click to call is an add-on for Internet explorer which enables Lync to identify phone numbers in websites and make calls by simply clicking on the phone number.

Prerequisites

Lync infrastructure \ Lync Client 2010\2013

Internet Explorer Latest

 

Enable ad-Ons

Open >> IE >> Internet Options >> Programs >> Add-on Types (Toolbars and Extensions) >> Enable

·         Lync Browser Helper

·         Lync Click to Call

Enable Number Detection by Click the Icon below and select “Enable number detection”

Or you can use

Tools >> click “Lync Click to Call”

Click on Lync icon to make calls

Lync client will open and click on dial to make the call

Roshan