HP GbE2c switch vs DeviceExpert

HP GbE2c switch vs DeviceExpert

I'm trying to save the configuration file of my HP GbE2c switch but it not works. T try to connect via ssh and the loggin process is successful but appear this message:

Credentials are valid. But the configuration file is not uploaded to the TFTP server.
 
Then i access the device via putty and i execute the next set of commands
 
/c/ptcfg <ipaddress-ExpertDevice> <filename>

but it require user and password. I try with user=admin and passw=admin (wich ) but it not works.
Why can i do????









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