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    <title>topic RDSH App connectivity issue : No shared memory channel. Horizon client service may be down. in Horizon Desktops and Apps</title>
    <link>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/514608#M76642</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi all,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We have an RDS farm to allow some external staff to connect in, via a UAG to a few apps. For some reason the service stopped working, and now when we try to connect inbound from the internet, users see a black screen and the request times out. Connecting from the LAN it works fine.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The UAG seems fine (no authentication issue and desktop list populates in the horizon client). The error logs on the client machine (from appdata and \VDM folder) show a mix of errors as below (grouped).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We've tried using different protocol (in its working state PCoIP was the display protocol on the host), recovering the farm, restarting services, upgrading vmware tools etc to no avail.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Any suggestions on these? A google suggests that there's an AD issue looking up the computer account, and yes, I've read the vmware KB &lt;A href="https://kb.vmware.com/s/article/2083784"&gt;https://kb.vmware.com/s/article/2083784&lt;/A&gt; - any other ideas!!??&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.958+00:00 ERROR (453C) [WinCDK] PartnerAppMgr::ChannelAddRef : No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:34.064+00:00 ERROR (453C) [WinCDK] USBDevices::FreeEnumData : CdkViewUsb failed to free enumeration. The reason is 'ViewUsbStatus_BadHandle'. The broker is 'smartext.uk.thalesgroup.com'. The desktop is 'CalculatorTest'.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.201+00:00 ERROR (453C) [libcdk] CdkClientInfo_GetMachineDistinguishedName: GetComputerObjectNameW failed with code: 0x00000547.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.201+00:00 ERROR (453C) [libcdk] CdkClientInfo_GetLoggedOnFQDN: GetUserNameEx failed with code: 0x00000534.&lt;/P&gt;&lt;P&gt;020-04-07T14:15:10.956+01:00 ERROR (4C54-9B38) &amp;lt;NodeManagerWatcher&amp;gt; [vmware-remotemks] Failed to initiate shared memory over RPC, server initiate failed.&amp;nbsp; 1722 (The RPC server is unavailable.)&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:10.956+01:00 WARN&amp;nbsp; (4C54-9B38) &amp;lt;NodeManagerWatcher&amp;gt; [vmware-remotemks] CORE::SharedMemChannel::Connect(): Channel (null) (0x0000000000000000): SharedMem Connect to SessionClient FAILED: RPC initiated sharedmem connect failed, reason=hostUnreachable&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.456+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.456+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::GetControllerMessageQueues: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.956+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.956+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::SendToAllControllers: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.362+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.362+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::GetControllerMessageQueues: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.862+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Tue, 07 Apr 2020 13:59:17 GMT</pubDate>
    <dc:creator>davebaker87</dc:creator>
    <dc:date>2020-04-07T13:59:17Z</dc:date>
    <item>
      <title>RDSH App connectivity issue : No shared memory channel. Horizon client service may be down.</title>
      <link>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/514608#M76642</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi all,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We have an RDS farm to allow some external staff to connect in, via a UAG to a few apps. For some reason the service stopped working, and now when we try to connect inbound from the internet, users see a black screen and the request times out. Connecting from the LAN it works fine.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The UAG seems fine (no authentication issue and desktop list populates in the horizon client). The error logs on the client machine (from appdata and \VDM folder) show a mix of errors as below (grouped).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We've tried using different protocol (in its working state PCoIP was the display protocol on the host), recovering the farm, restarting services, upgrading vmware tools etc to no avail.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Any suggestions on these? A google suggests that there's an AD issue looking up the computer account, and yes, I've read the vmware KB &lt;A href="https://kb.vmware.com/s/article/2083784"&gt;https://kb.vmware.com/s/article/2083784&lt;/A&gt; - any other ideas!!??&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.958+00:00 ERROR (453C) [WinCDK] PartnerAppMgr::ChannelAddRef : No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:34.064+00:00 ERROR (453C) [WinCDK] USBDevices::FreeEnumData : CdkViewUsb failed to free enumeration. The reason is 'ViewUsbStatus_BadHandle'. The broker is 'smartext.uk.thalesgroup.com'. The desktop is 'CalculatorTest'.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.201+00:00 ERROR (453C) [libcdk] CdkClientInfo_GetMachineDistinguishedName: GetComputerObjectNameW failed with code: 0x00000547.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:52.201+00:00 ERROR (453C) [libcdk] CdkClientInfo_GetLoggedOnFQDN: GetUserNameEx failed with code: 0x00000534.&lt;/P&gt;&lt;P&gt;020-04-07T14:15:10.956+01:00 ERROR (4C54-9B38) &amp;lt;NodeManagerWatcher&amp;gt; [vmware-remotemks] Failed to initiate shared memory over RPC, server initiate failed.&amp;nbsp; 1722 (The RPC server is unavailable.)&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:10.956+01:00 WARN&amp;nbsp; (4C54-9B38) &amp;lt;NodeManagerWatcher&amp;gt; [vmware-remotemks] CORE::SharedMemChannel::Connect(): Channel (null) (0x0000000000000000): SharedMem Connect to SessionClient FAILED: RPC initiated sharedmem connect failed, reason=hostUnreachable&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.456+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.456+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::GetControllerMessageQueues: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.956+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:15:11.956+01:00 ERROR (4C54-99A4) &amp;lt;39332&amp;gt; [vmware-remotemks] HccChannelPlugin::SendToAllControllers: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.362+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.362+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::GetControllerMessageQueues: ChannelAddRef failed!&lt;/P&gt;&lt;P&gt;2020-04-07T14:13:02.862+01:00 ERROR (7348-6F1C) &amp;lt;28444&amp;gt; [vmware-remotemks] HccChannelPlugin::ChannelAddRef: No shared memory channel. Horizon client service may be down.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 07 Apr 2020 13:59:17 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/514608#M76642</guid>
      <dc:creator>davebaker87</dc:creator>
      <dc:date>2020-04-07T13:59:17Z</dc:date>
    </item>
    <item>
      <title>Re: RDSH App connectivity issue : No shared memory channel. Horizon client service may be down.</title>
      <link>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/514609#M76643</link>
      <description>&lt;P&gt;To add more to this -&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;We have been able to successfully launch an app via RDSH to an external user but the reliability is intermittent. What seems to happen is that Pre-launch will commence shortly after authenticating with the connection server, then , if no pre-existing pre-launch session exists, it will try to create a new one. After exactly 1 minute, the 'new' session then expires. Attached image from our horizon logs:&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;/P&gt;&lt;TABLE border="0" width="1230" cellspacing="0" cellpadding="0"&gt;&lt;TBODY&gt;&lt;TR&gt;&lt;TD width="190" height="20"&gt;UKDN.\S0088161test2&lt;/TD&gt;&lt;TD width="190"&gt;Info&lt;/TD&gt;&lt;TD width="190"&gt;04/09/2020, 2:39 PM&lt;/TD&gt;&lt;TD width="82"&gt;Broker&lt;/TD&gt;&lt;TD width="578"&gt;Get launch items timing profile for \S0088161test2 on XHZWIN0402, duration: 32&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:34 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;null application launch timing profile for UKDN\s0088161test2, duration: 124337&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Audit failure&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:33 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;Unable to launch from Pool a-uat-muapp-f1 for user UKDN\s0088161test2: There were no machines available that reported protocol [BLAST] as ready&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Warning&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:33 PM&lt;/TD&gt;&lt;TD&gt;Agent&lt;/TD&gt;&lt;TD&gt;The pending session on machine AS12UATMuApp101 for user UKDN\s0088161test2 has expired&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:32 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested Pool a-uat-muapp-f1, allocated machine AS12UATMuApp101&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:32 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested Application a-uat-muapp01-goal_b1&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:32 PM&lt;/TD&gt;&lt;TD&gt;Agent&lt;/TD&gt;&lt;TD&gt;The agent running on machine AS12UATMuApp101 has accepted an allocated session for user UKDN\s0088161test2&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Warning&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:30 PM&lt;/TD&gt;&lt;TD&gt;Agent&lt;/TD&gt;&lt;TD&gt;The pending session on machine AS12UATMuApp101 for user UKDN\s0088161test2 has expired&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:29 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested Pool a-uat-muapp-f1, allocated machine AS12UATMuApp101&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:29 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested Application a-uat-muapp01-goal_b1&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:29 PM&lt;/TD&gt;&lt;TD&gt;Agent&lt;/TD&gt;&lt;TD&gt;The agent running on machine AS12UATMuApp101 has accepted an allocated session for user UKDN\s0088161test2&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Warning&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:28 PM&lt;/TD&gt;&lt;TD&gt;Agent&lt;/TD&gt;&lt;TD&gt;The pending session on machine AS12UATMuApp101 for user UKDN\s0088161test2 has expired&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:27 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested Pool a-uat-muapp-f1, allocated machine AS12UATMuApp101&lt;/TD&gt;&lt;/TR&gt;&lt;TR&gt;&lt;TD height="20"&gt;UKDN\s0088161test2&lt;/TD&gt;&lt;TD&gt;Info&lt;/TD&gt;&lt;TD&gt;04/09/2020, 2:27 PM&lt;/TD&gt;&lt;TD&gt;Broker&lt;/TD&gt;&lt;TD&gt;User UKDN\s0088161test2 requested an application session from Pool a-uat-muapp-f1, pre-launch true&lt;/TD&gt;&lt;/TR&gt;&lt;/TBODY&gt;&lt;/TABLE&gt;&lt;P&gt;I changed the pre-launch session timeout to 'Never' and tried to log in again and the audit failure at 2:33pm suggested no machines available, so would this suggest a licensing issue? Previosuly we've never seen this error because we didn't tweak pool settings.&lt;/P&gt;&lt;P&gt;Any guidance or troubleshooting ideas would be appreciated,&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Dave&lt;/P&gt;</description>
      <pubDate>Mon, 04 Oct 2021 15:34:17 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/514609#M76643</guid>
      <dc:creator>davebaker87</dc:creator>
      <dc:date>2021-10-04T15:34:17Z</dc:date>
    </item>
    <item>
      <title>Re: RDSH App connectivity issue : No shared memory channel. Horizon client service may be down.</title>
      <link>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/2870406#M95008</link>
      <description>&lt;P&gt;Hello. Did this happen to ever get resolved? We're experiencing something kind of similar in our environment, detailed in this thread below. Thanks in advance.&lt;/P&gt;&lt;P&gt;&lt;A href="https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/Published-App-Fails-on-Initial-Launch/m-p/2870401#M95007" target="_blank" rel="noopener"&gt;Re: Published App Fails on Initial Launch - VMware Technology Network VMTN&lt;/A&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 06 Oct 2021 02:55:46 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Horizon-Desktops-and-Apps/RDSH-App-connectivity-issue-No-shared-memory-channel-Horizon/m-p/2870406#M95008</guid>
      <dc:creator>epa80</dc:creator>
      <dc:date>2021-10-06T02:55:46Z</dc:date>
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