Set System Date in Mac OS X from Command Line with a Central Time Server. For ntpdate, which sets the date and time based on the time from a central server accessed via the internet, you’d want to point it either at Apple’s time servers or pool.ntp.org as follows to get the exact time. Skype for Business in Office 2016 keeps asking for credentials Skype for Business will open and login but then a window asking for credentials will pop up even though I'm already logged in. When I enter my credentials and click 'save my credentials', Skype for Business crashes. Click the magnifying glass in the upper-right hand corner of your screen and type “Keychain Access” and hit Return. Click “View” in the menu bar at the top of your screen and select “Show Expired Certificates.” Use the search bar in the upper-right of the Keychain Access window and look for “digicert high.”. 15th May 2019 Update: The date has moved from July 1st 2019 to January 15, 2020. 12th January 2020 Update: The date has moved to 15th July 2020 – details here If you have SfB Certified IP Phones (3PIP) from AudioCodes, Crestron, Polycom or Yealink signing into to Skype for Business Online (or Microsoft Teams via cloud interop), you will need to firmware update them and take one time tenant.

With the many different types of endpoints and network configurations that organizations use, there can be different ways that users connect to their Skype for Business environment, and as such, different sources of issues when connecting. Microsoft has developed detailed instructions for IT administrators to diagnose the issues and fix the problems based on the root causes. Below are the instructions provided by Microsoft:

Scoping the problem

Let’s assume that you want to troubleshoot issues that occur when users try to join a Skype for Business Online (formerly Lync Online) meeting by using Lync 2010, Lync 2013, the Lync for Windows Store app, or Lync for Mac 2011. Before you start, ask yourself and any external users who are experiencing the issue the following questions:

How many users does the problem affect?
Are the users internal or external to your organization?
Can the affected users reproduce the problem on a single computer or on multiple computers?

When you have the answers to these questions, see the following table to determine the kind of issue that you’re dealing with. This table is provided to help scope the problem to a certain category. However, some categories may be outside the technical support boundaries of a Skype for Business Online support engineer.

Read the table as in the following example: Multiple users… (but not a single user) …from outside our organization…Can’t join a Skype for Business Online meeting from multiple computers: (is usually caused by) Lync federation issue or external network issue.

Be aware that each column and each row are mutually exclusive. That is, the issue affects either a single user or multiple users, and the issue can be reproduced either on one computer or on multiple computers.

A single user…A single user…A single user…Multiple users…Multiple users…from inside our organizationfrom outside our organizationfrom inside our organizationfrom outside our organizationfrom both inside and outside our organizationCan’t join a Skype for Business Online meeting from a single computerClient issueClient issueClient issueClient issueClient issueCan’t join a Skype for Business Online meeting from multiple computersUser identity issue or provisioning issueLync federation issue or external network issueNetwork issue or Service outageLync federation issue or external network issueService outage or network issue

PROBLEM

Note Most of the issues can be resolved by following the Lync Meeting join guided walkthrough and troubleshooter that’s at the following Microsoft website:

The Lync Meeting join guided walkthrough and troubleshooter

If you don’t experience one of the symptoms that are listed in the following table, use the scoping table in the “Scope” section to narrow the problem to a specific kind of issue. Then, you can troubleshoot the issue by following the steps that are outlined here.

Skype For Business Mac Date Time Certificate Error Number

SymptomCategoryTroubleshootingWhen you try to click the Join Online Meeting link in a meeting invitation in Skype for Business Online, you receive one of the following error messages in Microsoft Internet Explorer:Network connectivityTroubleshoot network issuesPage not foundPage cannot be displayedWhen Skype for Business Online tries to start an online meeting, the client program freezes.Client issueTroubleshoot client issuesWhen you try to click the Join Online Meeting link in a meeting invitation, you are repeatedly presented with a security warning and can’t join the meeting.Client issueTroubleshoot client issuesWhen you try to click the Join Online Meeting link in a meeting invitation, you receive the following message:User Identity or Provisioning IssueTroubleshoot identity issuesError: Meeting URL is not valid.When you use Skype for Business Online to join a Lync conference that is organized by another company, you receive the following error message:Lync Federation issueMake sure that Domain Federation or External Communications are configured correctlyreference ID 43 (source ID 241)When you click the Join Online Meeting link in a meeting invitation, a File Open dialog box appears. Additionally, Skype for Business Online doesn’t start the online meeting.Incorrect file associationFixing OCSMEET file associations in WindowsYou tried all steps in this document and still can’t join the Skype for Business Online meeting. You are determined to connect to the conference, even if you can’t participate in audio, video, or chat.Not applicableJoin meetings by using the Lync Web App

Troubleshooting Windows client issues

To resolve any client or computer issue, first make sure that the computer is up to date. The computer should have the latest operating system updates, audio and video drivers, and software application updates to make connecting to a Skype for Business Online meeting a successful experience. To do this, follow these steps:

Skype for business mac date time certificate error list

Run Windows Update, and then verify that all optional hardware updates are installed. Specifically, make sure that video, audio, and network drivers are up to date.
Verify that Lync is up to date. Go to the following TechNet page for the latest Lync updates:

Lync Downloads and Updates

Select your version (2013 or 2010), and then select Lync client under Category.

Now that the computer is up to date and meets all minimum system requirements, clear any cached credentials or certificates from previous logons:

Verify that the user has the correct certificates in Certificate Manager. To do this, follow these steps:

Open Windows Certifica