Skype For Business Mac Date Time Certificate Error

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Skype For Business Mac Date Time Certificate Error 4,9/5 6823 reviews

All TLS server certificates must comply with these new security requirements in iOS 13 and macOS 10.15:

  • TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits. Certificates using RSA key sizes smaller than 2048 bits are no longer trusted for TLS.
  • TLS server certificates and issuing CAs must use a hash algorithm from the SHA-2 family in the signature algorithm. SHA-1 signed certificates are no longer trusted for TLS.
  • TLS server certificates must present the DNS name of the server in the Subject Alternative Name extension of the certificate. DNS names in the CommonName of a certificate are no longer trusted.

Additionally, all TLS server certificates issued after July 1, 2019 (as indicated in the NotBefore field of the certificate) must follow these guidelines:

  • TLS server certificates must contain an ExtendedKeyUsage (EKU) extension containing the id-kp-serverAuth OID.
  • TLS server certificates must have a validity period of 825 days or fewer (as expressed in the NotBefore and NotAfter fields of the certificate).

Connections to TLS servers violating these new requirements will fail and may cause network failures, apps to fail, and websites to not load in Safari in iOS 13 and macOS 10.15.

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:

After you install either the April 2016 or May 2016 updates for Microsoft Office 2016 or Office 2013, you may experience random crashes of Microsoft Skype for Business 2016, Lync 2013, Outlook 2016. Check whether the business Skype account is assigned to your SIP Profile by displaying the SIP Profile’s details in Skype Manager and looking at the Incoming calls row. If it is not assigned to the profile, assign the business Skype account to your SIP Profile, then test whether you can now receive calls using the business Skype account.

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.

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:

  1. 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.
  2. Verify that Lync is up to date. Go to the following TechNet page for the latest Lync updates:

Herunterladen davinci resolve lite 8.2.2 for mac. Lync Downloads and Updates

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

Skype for business user certificate

Motu traveler driver. 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:

  1. Open Windows Certificate Manager. To do this, click Start, click Run, type certmgr.msc, and then click OK.
  2. Expand Personal, and then expand Certificates.
  3. Sort by the IssuedBy column, and then look for a certificate that is issued by Communications Server.
  4. Verify that the certificate is present and that it isn’t expired.
  5. Delete the certificate, and then try to sign in to Skype for Business Online. If you can’t sign in to Skype for Business Online, go to step 2.
  6. Remove the user’s Skype for Business Online credentials from the Windows Credential Manager. To do this, follow these steps:
  7. Click Start, click Control Panel, and then click Credential Manager.
  8. Locate the set of credentials that are used to connect to Skype for Business Online.
  9. Expand the set of credentials, and then click Remove from Vault.
  10. Try to sign in to Skype for Business Online, and then type the new set of credentials.

Skype for Business Online falls back to “anonymous join” if it can’t authenticate. As long as anonymous participants aren’t explicitly blocked from joining the meeting, they should always be able to join the meeting.

Troubleshooting network issues

  1. Verify that the computer is connected to the network. Determine whether the computer can access other websites.
  • Verify that the network meets the requirements for connecting to Skype for Business Online. For more information, go to the following Microsoft Knowledge Base article:

    • 2409256 You can’t connect to Skype for Business Online, or certain features don’t work, because an on-premises firewall blocks the connection

    Fixing OCSMEET file associations in Windows

    Verify that Skype for Business Online is the default program that is used to open .ocsmeet files. To do this, follow these steps:

    1. Click Start, click Control Panel, and then click Default Programs.
    2. Click Associate a file type or protocol with a program.
    3. Scroll down to .ocsmeet, and then verify that Microsoft Lync is selected as the Current Default option.
    4. If step 1 doesn’t resolve the issue, perform an Office installation repair, or reinstall Lync 2010.

    Troubleshooting Identity issues

    This specific issue occurs when two users of the same Office 365 organization share the same user name (alias). Because of how Lync generates meeting URLs, two users on the same Office 365 organization who have the same user name will share the same meeting URLs. This causes the Skype for Business Online conference to become corrupted.

    To resolve this issue, change the user name of one of the users who has the duplicate user name. For information about how to edit and change user accounts in Office 365, see the following Help topic:

    Create or edit users

    Troubleshooting Lync federation issues

    If external users (and only external users) can’t join a Skype for Business Online meeting, first determine whether they’re trying to join as authenticated users or as anonymous users.

    • If the user is trying to join as an authenticated user from another Lync or OCS organization:
      • Your Skype for Business Online organization must have External Communications enabled, and external communication must be completely open. Or, the external user’s domain must be in the Allow list.

    For help in enabling and troubleshooting domain federation, visit the guided walkthrough on Skype for Business Online External Communications:

    Set up Skype for Business Online external communications

    Configuring Federation support for a Skype for Business Online customer

    • If the user is trying to join as an anonymous user from Lync Attendee, or if the Lync Web App or is dialing in to a Skype for Business Online conference with an ACP access number:
      • For anonymous join to work, a specific DNS SRV record must be present in DNS.
      • For various methods of confirming your Skype for Business Online DNS records, click the following article number to view the article in the Microsoft Knowledge Base:

    2566790 Troubleshooting Skype for Business Online DNS configuration issues in Office 365

    Joining meetings by using the Lync Web App

    If these troubleshooting steps don’t resolve the issue, and if joining the meeting immediately is a bigger concern, use the Lync Web App. Be aware that the Lync Web App doesn’t include Voice over IP (VoIP) functionality. That means that participants can only view sharing sessions. To do this, follow these steps:

    1. Copy the Join URL from the meeting invite, and then paste it into Internet Explorer. (Warning: Don’t press Enter yet.)
  • Add “?sl=1” to the end of the URL, and then press Enter.

    • Note You must have Silverlight installed to use the advanced features of the Lync Web App.

    Troubleshooting issues with third-party software

    If you’re using third-party software, you may be asked to update, disable, or remove the software as a troubleshooting step. If the issue is resolved after you take one of these actions, you may be referred to the third-party manufacturer for more help or to perform additional troubleshooting.

    Sources: https://support.microsoft.com/en-us/kb/2423848#bookmark-troubleshooting%20network%20issues

    https://support.office.com/en-us/article/Troubleshoot-Skype-for-Business-Lync-Audio-68d84cf2-5d8c-4c91-bda6-69755f3fa165

    Martin Feehan, PEI