SDP not marking as Online one of our technician

SDP not marking as Online one of our technician

Guys,

We have a problem in our ServiceDesk in build number 14304.

One of our technician, even if he clicked on online status, is showing on list of technician as offline -> he not get any ticket for this.

We tried:
-Restart Services
- Test on many browsers
- Test incognito mode
- Clear caches/cookies of browsers

Still from our view, status is online but from any other account offline. 
Have you any idea? 

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