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Get Skype Sign-in problems support for your Skype for Mac and stay connected with friends and family from wherever you are. Unable to connect to Skype. If you are experiencing issues connecting to Skype, go to the Skype Status page to check for any current issues. Troubleshooting issues with Skype call quality. Having problems with the quality of your Skype call? Your internet connection – or your friend’s – is the most likely culprit. If you see a 'Sorry we couldn't connect to Skype', 'Skype can't connect' or 'Unable to receive notifications' message when you try to use Skype, the most likely. If you are experiencing issues connecting to Skype, go to the Skype Status page to check for any current issues. You can also try the following steps for additional help: Verify your device has a working internet connection with the required bandwidth. Verify you have the latest version of Skype.-->
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.
|Issue||A single user from inside our organization||A single user from outside our organization||Multiple single user from inside our organization||Multiple users from outside our organization||Multiple users from both inside and outside our organization|
|Can't join a Skype for Business Online meeting from a single computer||Client issue||Client issue||Client issue||Client issue||Client issue|
|Can't join a Skype for Business Online meeting from multiple computers||User identity issue or provisioning issue||Lync federation issue or external network issue||Network issue or Service outage||Lync federation issue or external network issue||Service outage or network issue|
Mac app switching graphics software. Note
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.
|When you try to click the Join Online Meeting link in a meeting invitation in Skype for Business Online, you receive 'Page not found' or 'Page cannot be displayed' in Microsoft Internet Explorer.||Network connectivity||Troubleshoot network issues|
|When Skype for Business Online tries to start an online meeting, the client program freezes.||Client issue||Troubleshoot client issues|
|When 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 issue||Troubleshoot client issues|
|When you try to click the Join Online Meeting link in a meeting invitation, you receive the error 'Meeting URL is not valid'.||User Identity or Provisioning Issue||Troubleshoot identity issues|
|When you use Skype for Business Online to join a Lync conference that is organized by another company, you receive the error 'reference ID 43 (source ID 241)'.||Lync Federation issue||Make sure that Domain Federation or External Communications are configured correctly|
|When you click the Join Online Meetinglink in a meeting invitation, a File Opendialog box appears. Additionally, Skype for Business Online doesn't start the online meeting.||Incorrect file association||Fixing OCSMEET file associations in Windows|
|You 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 applicable||Join 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:
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. See Lync Downloads and Updates for the latest Lync 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 Certificate Manager. To do this, click Start, click Run, type certmgr.msc, and then click OK.
- Expand Personal, and then expand Certificates.
- Sort by the IssuedBy column, and then look for a certificate that is issued by Communications Server.
- Verify that the certificate is present and that it isn't expired.
- 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.
Remove the user's Skype for Business Online credentials from the Windows Credential Manager. To do this, follow these steps:
- Click Start, click Control Panel, and then click Credential Manager.
- Locate the set of credentials that are used to connect to Skype for Business Online.
- Expand the set of credentials, and then click Remove from Vault.
- 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.
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Troubleshooting network issues
- 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, see 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:
- Click Start, click Control Panel, and then click Default Programs.
- Click Associate a file type or protocol with a program.
- Scroll down to .ocsmeet, and then verify that **Microsoft Lync **is selected as the Current Default option.
If step 1 doesn't resolve the issue, perform an Repair an Office application, 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.
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.
- The external organization must have federation configured correctly from their side, too.
- For more information about federating with a Skype for Business Online organization, go to the following Microsoft TechNet website: Configuring Federation support for a Skype for Business Online customer
- If authenticated join doesn't work, Lync should automatically try to join as an anonymous or guest user.
- 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, see 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:
Skype Connection Problems
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.
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.
Still need help? Go to Microsoft Community.-->
Sometimes things aren't working like you expect. Here is a list of topics that can help you fix problems, whether you're administrating Skype for Business Online or helping your users solve their problems.
Troubleshoot admin issues for Skype for Business Online
You can get answers for most of your Skype for Business Online questions in the article Check for common causes of Skype for Business Online sign-in errors. The following KB article also includes many troubleshooting resources and error code references: Troubleshooting Skype for Business Online sign-in errors for administrators.
For dial-in conferencing issues, see Audio Conferencing troubleshooting and known issues.
Additional help for Skype for Business Online admin issues
Help your Skype for Business Online users
Most of the problems faced by Skype for Business Online users are related to forgotten passwords. You can solve most of the sign-in problems by following the instructions in these two topics:
Additional resources to help your Skype for Business Online users
Still need help? Contact support.
As an admin for Microsoft 365 Apps for business, you get free access to our knowledgeable support agents for pre-sales, account, and billing support, as well as for help resolving technical issues. You can also contact support on behalf of Microsoft 365 and Office 365 users in your organization.
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If you're using Office 365 operated by 21Vianet in China, please contact the 21Vianet support team.