If a firewall or a proxy is preventing Lync from connecting to EWS, you may experience symptoms such as repeated credential requests, stale ABS, and intermittent Free/Busy presence issues.
For more information, see the following Microsoft Knowledge Base article: If Outlook can't connect to Exchange, troubleshoot the issue as an Exchange connectivity issue. To resolve this issue, verify that Outlook has connectivity to the mailbox. If the Exchange server or EWS is unavailable, this causes Lync to continuously prompt for credentials because it can't contact Exchange for authentication. If you're repeatedly prompted to enter your credentials or receive the "Access Denied" error message, see the following Microsoft Knowledge Base article:Ģ630976 "Access Denied" error, or user is repeatedly prompted for credentials when trying to connect to Office 365 by using a rich client application Solutions for Lync administrators Lync can't connect to Outlook or EWS If you are still prompted after you enter your credentials, see the following Microsoft Knowledge Base article:Ģ787614 Conversation history, contact cards, Free/Busy, and Out of Office information are unavailable when Lync fails to connect to Exchange If Lync doesn't automatically connect to EWS, Lync prompts you for credentials before it lets you access the EWS URLs. If you are prompted repeatedly after you enter your credentials, see the following Microsoft Knowledge Base article:Ģ436962 "There was a problem connecting to Microsoft Office Outlook" error when you sign in to Skype for Business Online If Lync doesn't integrate automatically with Outlook, Lync prompts you for credentials before it lets you connect to Outlook to retrieve Calendar and Free/Busy information.
If the problem persists, go on to the next section. Restart both Internet Explorer and Lync to check whether the problem is resolved.If your organization requires you to enter specific information for the proxy server or an automatic configuration script, contact your network administrator. Make sure that the Automatically detect settings option is selected.On the Tools menu, click Internet Options, click Connections, and then click LAN Settings.To resolve this problem, verify that the user has the correct proxy configured in Internet Explorer. If a firewall or a proxy is blocking Lync from connecting to EWS, you may experience symptoms such as repeated credential requests, stale Address Book Service (ABS), and intermittent Free/Busy presence issues. If Lync continues to prompt you for credentials after it has done this several times, there's probably an issue with Outlook or with the Exchange services. Lync generally prompts you for credentials only after you're signed in and when it must connect to an external service such as the Microsoft Exchange Free/Busy service or the Exchange Calendar service. This issue occurs for multiple reasons, and in certain scenarios, it is the expected behavior. Calendar and Free/Busy information from Outlook.You may be prompted for credentials when Lync tries to connect to any of the following services:
The message that you receive may vary, depending on which service Lync is trying to connect to.
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