Environment:
There are two set of the database development testing, are deployed on Linux (generally referred to as A library, the library B); Corresponding to the two sets of test system, also deployed on Linux (A1 system, A2); Above all deployment in four different Linux on board; Two sets of independent system, connect the respective library respectively,
On the virtual machine development, the development on the eclipse system two databases can be used,

Question:
Do not use the virtual machine, and make your laptop connected to LAN: libraries can use dbvisualizer connection A, but the connection B library to errors in the image above, and then in the CMD window ping library, A library and B can ping; Use Telnet to ping the IP + port, A library can pass, B can't pass, so I went to the virtual machine Telnet two libraries, can pass found, for a phone online, also didn't really solve the problem,