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Download and install. Skype for Business is typically installed with Microsoft 365. If you have Microsoft 365 but don't already have Skype for Business and need to install it, see: Install Skype for Business on Windows. Install Skype for Business on a mobile device.
To troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. If necessary, you can then follow specific resolution steps based on the type of error. If the user still cannot sign in, collect additional information, and then seek additional help.
What do you want to do?Check for common causes of Skype for Business Online sign-in errors
Most sign-in issues can be traced to a small number of causes, and many of these are easy to correct. The table below lists some common causes of sign-in errors and some steps you or the users can take to resolve them. Madden 13 free download mac.
To troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. If necessary, you can then follow specific resolution steps based on the type of error. If the user still cannot sign in, collect additional information, and then seek additional help.
Skype Tx Download For Mac DownloadFollow resolution steps for a specific error (Enterprise only)
Important
These instructions are intended primarily for Microsoft Office 365 Plan E customers. If you are an Office 365 Plan P customer, continue to the following section, Collect more information and seek additional help.
If the user cannot sign in after you have tried the suggestions in the previous section, then you can do additional troubleshooting based on the type of error. The table below lists the most common error messages and possible causes. Following the table are detailed procedures to address each issue.
Add a firewall entry for msoidsvc.exe to your proxy server
This procedure is a possible fix for the following error message: Sign-in address not found.
Note
The following steps assume you are using Microsoft Forefront Threat Management Gateway (TMG) 2010. If you have a different web gateway solution, use the settings described in step 4 below.
To create an application entry for Msoidsvc.exe in Forefront TMG 2010, follow these steps:
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For details, see the Microsoft Knowledge Base article 2409256, You cannot connect to Skype for Business Online because an on-premises firewall blocks the connection.
Update DNS settings
If your organization has a custom domain, this procedure is a possible fix for the following error message: Server is temporarily unavailable.
For details, see the Microsoft Knowledge Base article 2566790, Troubleshooting Skype for Business Online DNS configuration issues in Microsoft 365 or Office 365.
Install a third-party SSL certificate on your ADFS server
To install a third-party SSL certificate on your Active Domain Federation Services (ADFS) server, follow these steps:
Update security credentialsSkype Tx Download For Mac Windows 7
This procedure is a possible fix for the error message Problem acquiring a personal certificate required to sign in.
To eliminate possible certificate or credential problems, first renew the user's certificate in Windows Certificate Manager. To do this, follow these steps:
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Next, if the user is running Windows 7, remove their stored credentials in Windows Credential Manager. To do this, follow these steps:
Finally, if the user still cannot sign in after you've updated their credentials, try deleting the RSA folder on the user's computer, because it could be blocking completion of the user authentication process:
Modify TrustModelData registry keys
When a user signs in for the first time, they may receive a dialog box that contains something like the following: Cannot verify that the server is trusted for your sign-in address. Connect anyway? This is a security feature, and not an error. However, you can prevent the dialog box from appearing by using a Group Policy Object (GPO) to update users' machines with your domain name before they sign in for the first time. To accomplish this, do the following:
Important
You must append your domain name to the existing value, not simply replace it.
For details, see the Microsoft Knowledge Base article 2531068, Skype for Business (Lync) cannot verify that the server is trusted for your sign-in address.
Update user settings in Active Directory
If your organization had a previous installation of Microsoft Office Communications Server or Microsoft Lync Server 2010, you may not have deleted your users from the server before decommissioning it. As a result, the msRTCSIP-UserEnabled attribute is still set to FALSE in Active Directory Domain Services.
To fix this issue, follow these steps:
To troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. If necessary, you can then follow specific resolution steps based on the type of error. If the user still cannot sign in, collect additional information, and then seek additional help.
![]() Use the Microsoft Support troubleshooting guide
If you're still not able to resolve the user's sign-in problems, review the suggestions in Microsoft Knowledge Base article 2541980, How to troubleshoot sign-in issues in Skype for Business Online.
Download Skype For Mac FreeCollect more information and seek additional help
If you've followed the guidance above and still can't resolve your sign-in issues, you must collect additional information and contact technical support. To do this, follow these steps:
You may be asked to supply additional diagnostic information by installing the Microsoft Online Services Diagnostic and Logging (MOSDAL) Support Toolkit on the affected user's machine. For details, see Using the MOSDAL Support Toolkit.
To troubleshoot Skype for Business Online sign-in errors, start by eliminating the most common causes of sign-in difficulty. If necessary, you can then follow specific resolution steps based on the type of error. If the user still cannot sign in, collect additional information, and then seek additional help.
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