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Active Sync is down on our Exchange 2013 server but client based is working fine. This error comes up nearly ever second or so. We had Microsoft Multi-Factor Authentication Server installed initially but didn't really like it so it was removed. Now this error is popping up.<br />
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How can I resolve?
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Active Sync is down on our Exchange 2013 server but client based is working fine. This error comes up nearly ever second or so. We had Microsoft Multi-Factor Authentication Server installed initially but didn't really like it so it was removed. Now this error is popping up.

How can I resolve?

The Module DLL C:\Program Files\Multi-Factor Authentication Server\pfiisnm.dll failed to load.  The data is the error.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.