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Citrix sessions repeatedly disconnect and automatically reconnect for no apparent reason.
The first assumption?
Network issues, packet loss, firewalls or an unstable UDP connection.
But the cause does not always lie in the network.
🔎 The problem
Using EDT (Enlightened Data Transport) over HDX Direct can result in repeated session disconnects and reconnects.
The interesting part: the connection is established, but does not remain stable.
Citrix documents this behavior under issue CVADHELP-29336.
🛠️ The cause
A cipher mismatch when using EDT over HDX Direct.
The cause is therefore not necessarily poor network quality, but a problem negotiating or using encryption.
This makes troubleshooting particularly interesting because the initial symptoms strongly resemble a conventional network issue.
💡 What should you check?
✅ Is the affected session actually using EDT over HDX Direct?
✅ Do disconnects occur only with UDP/EDT?
✅ Does the same session remain stable over TCP?
✅ Do Citrix diagnostic data indicate transport or encryption errors?
✅ Which VDA version and cumulative update level are installed?
Important: switching to TCP can help narrow down the issue, but is not a permanent solution to the underlying problem.
🔧 The fix
Citrix lists CVADHELP-29336 in the fixed issues for Citrix Virtual Apps and Desktops 2507 LTSR CU1.
🎯 My takeaway
Not every Citrix reconnect is a network issue.
With EDT, HDX Direct and multiple transport paths, troubleshooting is becoming increasingly complex.
If TCP is stable but EDT constantly reconnects, investigate known Citrix transport issues as well as firewalls and packet loss.
