Java console NBU 7.6.0.4

Hi,

I have one master server and two media servers with the same versions bellow:

Windows 2012 R2 x64

NBU 7.6.0.4

When I try to logon NBU java admin console with "master server" in host name filed, it shows me this message "Unable to login, status: 509 - Can not execute program"

If a change host name to anyone media servers, it running normally, open media server.

Can anybody help?

Thanks.