Resolution Note For Event Id 9017 Citrix

Users are unable to log in to help them with the XenApp farm and receive the following error message:
Licensing error (500): Unable to license server (server name). Contact your system or administrator. Usually open Event Viewer for more information. “
When users talk in the web interface and workspace control is enabled, the following error message may be displayed on the web interface page:
” Your server farm is not accredited to do zone management work. This was reported by the address of the xml service xmlBrokerAddress. “
The following events may be logged in the system event log of this server:

Event ID: 9014Description: The licenses expected for this release of Citrix Presentation Server are not available on the server hostinglicense change LicenseServerName.9017Description:eventid: This computer running Citrix Presentation Server is no longer accepting connections. This server is no longer in the license grace period or can no longer participate.Event ID: 9026Description: The errorNumber received while obtaining a license for a Citrix Presentation Server client connection. A concessional license was granted.Event ID: 9027Description: An errorNumber received while trying to get an available license for a Metaframe client connection. The requested certification was denied. “

This issue occurs when, for whatever reason, the tiered communication between the XenApp server and the license server is broken. Citrix is ​​requesting a health check on the network connectivity of the affected XenApp servers and license servers. In some cases, examining the calendar files and computer hardware diagnostic tools reveals a large number of errors, such as CRC errors. The problem can be solved by replacing the network cables, moving faulty switches or moving servers to other switch ports.
Released updates make XenApp more resilient to network issues and latency.
Citrix Licenses – Last Boot
When the latest updates are applied, usually a communication problem occurs, the XenApp server drops connections to the license server. This will return the persistent connection between the XenApp server and the license server to a restored state, unless there are other network problems. It is important to note that when the connection is reset, all permissions received by the affected XenApp server are archived and reactivated as soon as the reset is complete.
The following system event log messages may appear:

In XenApp for Windows 2008:

Source: MetaFrameEvent ID: 9034Description: The Citrix accreditation request has timed out. This could indicate a communication problem between the server and the license server. As a result, the server dropped the transfer with the license server. All licenses checked out from this server have been checked again and an attempt will be made to check the licenses again

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In Presentation Server 4.5:

Source: MetaFrameEvent ID: 9030Description: The Citrix license request has expired. This could indicate a communication problem between the server and the license hosting server. As a result, the newly loaded server maintains a connection to the license server. All licenses obtained from this server have been re-registered and an attempt will be made to recheck the required licenses.

In Presentation Server 4.0:

Source: MetaFrameEvent ID: 9031Description: The Citrix license request has expired. This could indicate a communication problem between the server and the current license server. As a result, the forum dropped the connection to the license server. All licenses checked out from this management server have been re-registered, so an attempt will be made to re-check most of the checked out licenses.

Note. If situations are logged multiple times, users can still log into XenApp. However, errors indicate “network” problems that need to be investigated.
The recommended step for solving the problem is nowtime to change the owner of the license server in the console if the affected server is accidentally lost. Server, and then switch back to the Citrix authoritative license server. If the discovered servers inherit their license server information from the farm settings, clear the Use farm and license server ownership settings option for each server.