Skype for Business on Mac will automatically close the call window when you hang up a person-to-person phone call as long as no one has sent IMs in the conversation. Monitor the quality of your audio and video calls. Hi All, I am trying to deploy VVX 400 phone at a site with Skye for business. SFb cluster is at the DC. I have created DHCP scope for phones and I can see certificate has been downloaded successfully by the phones However when I try to login using web interface or phone it gets stuck at @Singing i.

I've been having this issue for quite some time as well, and have been working with a Microsoft Skype for Business (SfB) support engineer on it. To be certain it's the same, or similar-enough issue, here's the setup I've been working with (or against it seems):

* Skype for Business 2016 (any version, including latest in the insider 'Fast Ring' releases)

* Macbook Pro - Early 2011

* OS X 'El Capitan' - v10.11.6

* Corporate domain is on Azure AD (Active Directory)

* When signing in with the AD account, you are either a) Given a choice between 'Work or school account' or 'Personal account), b) usually automatically redirected to the company branded signon page.

If that matches up, the next step is to check the certificate which is on domain's federation services (ADFS) host. This may require getting IT involved to find it, or reviewing the SfB logs.

When you get the host name, for example, 'adfs.mycompany.com', go to that address via HTTPS in Safari. So you'd go to 'https://adfs.mycompany.com'. Once there, click on the lock to the left of the address in the address bar and click the 'Show Certificate' button. Make sure that the selected certificate, in the tree view at the top, is the bottom-most one. The bottom pane should show some brief certificate info (Issued by, Expires, 'This certificate is valid' type message, etc.). Expand the 'Details' section in that lower pane, and look for the 'Signature Algorithm' line, which should be, roughly, the 12th one down. If on that line, you have something similar to 'SHA-512 with RSA Encryption' (forget about the long number afterward), then that is the source of the issue with logging on, and also, activating Office 365 (if you have a company account for it).

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OS X prior to 10.12 (Sierra) does not *natively* support 512 bit certificate signatures. So while browsers and everything else shows that, yes, the certificate is good, valid, unexpired, etc, the low level network stack in OSX, which is used by SfB to initially connect, does not, so it cannot validate that the certificate is valid, thus causing this issue.

Unfortunately, at this time, there doesn't appear to be a way to wedge in support for 512 algorithms in OSX, and that includes forcibly upgrading/linking openssl. The only way I've found to date, to use SfB on anything less than 10.12.x, is to essentially MITM yourself, using a proxy application, such as Charles, which will create its own fake certificate which you must trust, to connect.

I apologize for such a long writeup, but given that despite my hours and hours and hours spent over months of researching the issue, I hope to provide as much useful and helpful information as possible for any future Googlers/Bingers/DuckDuckGoers/etc.

Jul 13, 2017 8:50 AM

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Problem

When you try to sign in to Lync Mobile 2013, you may receive one of the following error messages:

• Can't sign in. Please check your account information and try again.
• Can't connect to the server right now. Please try again.
• The server name or sign-in address is incorrect. Please check them and retry.

Solution

You can resolve most sign-in issues in Lync Mobile 2013 by following these steps:

1. Make sure that the sign-in address and password are entered correctly. In most cases, the domain and user name are not required.

2. Expand More Details, and then click Clear My Sign-in Info to remove any cached server names or sign-in addresses.

3. Office 365 Skype for Business Online (formerly Lync Online) administrators can use the Remote Connectivity Analyzer to make sure that the necessary DNS records for Skype for Business Online are configured. To do this, click the Office 365 tab, and then click Office 365 Lync DNS Test.

   For more information, see Troubleshooting Skype for Business Online DNS configuration issues in Office 365.

4. Switch between Wi-Fi and carrier data to try to isolate the issue. Verify connectivity to other websites and services over both kinds of connections.

5. Try to sign in by using other clients and computers. If you can't sign in on any device, see How to troubleshoot sign-in issues in Skype for Business Online.

6. You recently updated the Operating System (OS) software for your device. Before you applied the update, the Lync Mobile 2013 client worked as expected. After you installed the update, the Lync Mobile 2013 client fails. Be aware that after you contact Microsoft technical support for help, you may have to contact the manufacturer of your device to obtain the correct resources for the issue.

More Information

These errors may occur for one or more of the following reasons:

• The user’s credentials aren't correct. Either the password is incorrect or the sign-in address was entered incorrectly.
• The server is too busy or unreachable over your current connection.
• The server can't be found, based on the sign-in address. Either the domain was typed incorrectly or the necessary DNS records for mobile connectivity aren't set up.
• You installed updated OS software and resources or settings may have to be configured for Lync Mobile 2013 to work correctly.

For help with the Microsoft Lync Mobile 2010 clients, see the following Microsoft Knowledge Base articles:

• 2636329 'Cannot connect to the server' error message when Skype for Business Online users try to sign in to the Lync 2010 mobile client on a mobile device
• 2636318 How to troubleshoot issues that you may encounter when you use the Lync 2010 mobile client for Windows Phone 7
• 2636320 How to troubleshoot issues that you may encounter when you use the Lync 2010 mobile client for Apple iOS
• 2636313 How to troubleshoot issues that you may encounter when you use the Lync 2010 mobile client for Google Android
• 2636322 How to troubleshoot issues that you may encounter when you use the Lync 2010 mobile client for Nokia Symbian

Still need help? Go to Microsoft Community.