Error "The server is unavailable. Check your configuration and network connection and try again" in Ax 2012 R2

dear all,

Please help me , It's urgent.

My client's PC can not access to AOS from axapta client.

the error message is : "The server is unavailable. Check your configuration and network connection and try again".

Sometime , it runs well. 

When i ping to server AOS, the network is stable. Antivirus's already been uninstalled in server and client pc. the firewall is off in client and server.

What should i do ?

Thanks in advance

Regards

Rudy

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