Thin Clients(aDesk-STD220) Unable to Obtain DHCP IP Address While PCs Work on Same Port (Sangfor VDI Environment)

Michael Addisu Lv1Posted Apr-04-2026 22:27

I am experiencing an issue where thin clients are unable to obtain an IP address via DHCP, while a PC connected to the same switch port successfully receives an IP address without any issues.
Details:

  • DHCP server is functioning correctly (confirmed with PC test)

  • Same network port and cable used for both PC and thin client

  • Issue is consistent across multiple thin clients

  • Thin clients fail to obtain IP address

Troubleshooting Done:

  • Verified DHCP server functionality

  • Tested same port with PC

  • Checked physical connectivity

  • Restarted thin clients



  • Are there specific network configuration requirements for Sangfor thin clients to obtain DHCP leases?

  Any recommended steps to diagnose or resolve this issue at scale (205 devices)?

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Muhammad Abid Lv2Posted Apr-07-2026 12:12
  
Yes, Sangfor thin clients aDesk-STD220 may fail to get DHCP IP even when PC works on same port due to network configuration differences.
Check these points:
Switch Port VLAN
Port should be in Access mode
Correct VLAN assigned
DHCP Scope
Ensure enough free IP addresses
Gateway (Option 3) and DNS (Option 6) configured
Port Security / NAC
Disable MAC binding, 802.1X, sticky MAC if enabled
DHCP Relay
If DHCP server is in another VLAN, configure ip helper-address
Firmware
Update aDesk-STD220 firmware from Sangfor console
Enable PortFast
Prevent DHCP delay issue
Recommended at scale (205 devices):
Test 1 device → verify VLAN & DHCP → apply same switch configuration to all ports.
Most cases issue is VLAN mismatch or port security restriction.


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