Wyse 5060 wtos RD Broker Sign-on Failed

hello 

We have a problem with wyse  v8.3_105  wtos usage to connect Microsoft RD Connection broker

with use this configuration file : 

;-------------------------------------------------------------
;- RDP Session 1 -
;- Each line but the last must end with a '\' -
;-------------------------------------------------------------

AddCertificate=xxxxx.cer
SessionConfig=RDP DefaultColor=2 EnableRecord=yes EnableTSMM=yes EnableNLA=yes
VDIBroker=ext.xxxxx.fr
ConnectionBroker=Microsoft
DomainList="xxxxxxx"

But don t work  . (error  ssl :unable to setup connection err=-7517 )

any idea ?

thanks