This occurs if users are accessing the servers through a load balancer, and not all servers in the pool are updated to at least the July 2021 security update. This condition may cause users to be redirected back to the login page when they use OWA or ECP.

This guide will help you troubleshoot session affinity issues with Azure Application Gateway, it also describes how to enable Application Gateway logging and use Fiddler for debugging.

If your sites are operating behind a load balancer, you can enable server affinity to temporarily work around the issue. This helps ensure that any given client only interacts with one physical server behind the load balancer so that all cryptographic payloads will be both generated by and consumed by the same server.

Introduces Kerberos authentication and explains how to troubleshoot delegation issues.

Describes how to troubleshoot free/busy issues that occur in a hybrid deployment of on-premises Exchange Server and Exchange Online in Office 365.

Follow the troubleshooting guidance that is offered by the Evaluating directory synchronization setup diagnostics wizard to correct the problems, and make sure that the diagnostics wizard runs without any errors. This prevents the following problems from occurring later in the implementation:

To resolve it, convert the network device with the static IP address to a DHCP client. Or, you can exclude the static IP address from the DHCP scope on the DHCP server. Turn off the DHCP client computer in conflict with the network device that has the static IP address.

Describes an issue that prevents Windows 10 devices from connecting to a WPA-2 Enterprise network that's using certificates for server-side or mutual authentication.

To help you identify the applications that might have compatibility issues after we enable DCOM security hardening changes, we added new DCOM error events in the System log. See the tables below.

Blocking connectivity to SMB might prevent various applications or services from functioning. For a list of Windows and Windows Server applications and services that may stop functioning in this situation, see Service overview and network port requirements for Windows.