Edge Transport server hangs in Exchange Server 2019 and 2016 Content provided by Microsoft Applies to: Exchange Server 2019Exchange Server 2016 Select Product Version All Products Symptoms An Edge Transport server stops responding because of a deadlock in the Shadow Redundancy Manager in Microsoft Exchange Server 2019 or Exchange Server 2016. Resolution To fix this issue, install one of the following updates:For Exchange Server 2019, install the Cumulative Update 6 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.For Exchange Server 2016, install the Cumulative Update 17 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016. References Learn about the terminology that Microsoft uses to describe software updates. Last Updated: 16 Jun 2020 Was this information helpful? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.