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https://support.citrix.com/article/CTX117248
If communication fails for any reason, it means that the VDA has failed to register with a controller and it would not be possible for the DDC to broker a connection to the VDM in question; and the VDM becomes an unusable resource.
https://support.citrix.com/article/CTX231023
Health Check detected that one of the following XenApp/XenDesktop services failed to connect to the database with current connection string settings: ADIdentity Service Analytics Service
https://support.citrix.com/article/CTX126991
If registry-based controller discovery is in use, which is the default mechanism, ensure that the desktop machine in question has been configured with a list of controllers that includes the controller that attempted the failed launch. See CTX118976 - How to Configure XenDesktop to Function Without an Organizational Unit in Active Directory.
https://discussions.citrix.com/topic/385709-vda-failed-to-connect-to-one-or-more-delivery-controllers/
Mar 22, 2017 · "Failed to connect to one or more Delivery Controllers. An incorrectly configured Controller can result in failure of the Virtual Delivery Agent to register with it, and applications and desktops being unavailable to users.". I have run the Citrix Health Assistant which, surprisngly,...
https://docs.citrix.com/en-us/xenapp-and-xendesktop/7-15-ltsr/manage-deployment/local-host-cache.html
Sep 06, 2019 · The Local Host Cache (LHC) feature allows connection brokering operations in a XenApp or XenDesktop Site to continue when an outage occurs. An outage occurs when the connection between a Delivery Controller and the Site database fails. Local Host Cache engages when the site database is inaccessible for 90 seconds.
https://developer-docs.citrix.com/projects/delivery-controller-sdk/en/latest/Broker/Test-BrokerDBConnection/
-- Failed: Connectivity between the Broker Service instance and the database has been lost for an extended period of time, or has failed due to a configuration problem. The service instance cannot operate while its connection to the database is unavailable. -- Unknown: Service status cannot be …
https://support.citrix.com/article/CTX218377
The Broker failed to send settings and configuration data to the VDA. As part of the hard registration process, the Broker gathers and sends settings and configurations to the VDA. If the Broker is able to gather the data, but is unable to send it, hard registration fails and this failure reason results.
https://docs.citrix.com/en-us/xenapp-and-xendesktop/7-15-ltsr/manage-deployment/delivery-controllers.html
Before a VDA can be used, it must register (establish communication) with a Delivery Controller in the Site. For information about VDA registration, see VDA registration with Controllers . (In the documentation for earlier XenApp and XenDesktop 7.x releases, information about VDA registration was included in …
https://support.citrix.com/article/CTX117449
When creating a desktop group in the Management Console, the virtual desktops appear as Not Registered. This article applies to deployments using OU-based VDA registration. Registry-based VDA registration is the modern standard. Other symptoms for this issue include the following:
https://docs.citrix.com/en-us/xenapp-and-xendesktop/current-release/downloads/Director-7.12-Failure-Reasons-Troubleshooting-Guide.pdf
with Delivery Controllers in XenDesktop for common problems that cause communication issues between [2] MachineFailure [3] RegistrationTim eout The VDA was powered on, but a time-out occurred while it was attempting to register with the Delivery Controller. Verify that the Citrix Broker Service is running on the Delivery Controller and that the
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