A tool like mturoute.exe can help determine the appropriate MTU for a network, as well as any additional built-in Network tools on the network appliances. This MTU value needs to be determined for each network independently and is not a one-size-fits-all solution. This workaround involves lowering the EDT MTU to a value that will not cause ICMP Fragmentation. Solution 2: Not using EDT MTU DIscovery and Setting the Value Manually: The following versions are the minimum requirements for using EDT MTU Discovery: If using this feature, Solution 2 in this article is not required.Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Wds\icawd.Citrix Virtual Apps and DesktLTSR introduced EDT MTU Discovery on VDA.Solution 1: Enable EDT MTU Discovery for the VDA Machine If setting the MTU/MSS rates manually, be sure to set the EDT MTU Discovery Registry key below to disabled (value 0). Note: If using MTU Discovery and setting the MTU/MSS manully, note that Discovery will overwrite the manual settings and Customers can expect to see a variable MTU/MSS rate instead of the static rate specified in the Storefront settings. Receiver for Windows 4.9, Workspace app for Windows 1808 .XenApp and XenDesktop 7.15 or Citrix Virtual Apps and Desktops 1808 ĮDT-capable Citrix Receiver / Workspace app: This is common when using VPN solutions like Cisco An圜onnect, when using Citrix Gateway hosted on Azure, when connected to certain Wi-Fi networks or mobile networks (3G, 4G, etc). These issues can result on performance issues in ICA sessions, on EDT connections failing and falling back to TCP, or even not being able to establish a session altogether. In the case of Citrix XenApp and XenDesktop / Virtual Apps and Desktops, this affects EDT since it is a UDP-based protocol. This can cause issues with applications that use UDP as transport protocol due to improper handling of UDP packet fragmentation. Different types of networks may have different MTU/MSS requirements, which may result on packets being fragmented when transmitted on those networks.
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