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Apple clients take very long time to get their certificate from radius server

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Information

 
TitleApple clients take very long time to get their certificate from radius server
Symptoms
Apple clients failing to 802.1x authenticate across an MPLS link
Environment
  • MPLS
  • WAN
  • RADIUS
  • IdentiFi
  • Firmware All
  • Microsoft IAS/NPS
  • 802.1x
  • MTU 
  • Certificate
Cause
Server hello certificate fragmentation issue.
Resolution
Add Framed-MTU to the RADIUS return attributes on the RADIUS Server.

This will only adjust the MTU for the wireless client to RADIUS server communication. It will not adjust the overall data transfer once the client is fully authenticated.
Additional notes

Windows Server 2003:
https://support.microsoft.com/en-us/kb/883389

Windows Server 2008 and 2012:
https://technet.microsoft.com/en-us/library/cc771164(v=ws.10).aspx

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