I can't connect to Oracle from a virtual machine, what's the problem?

Question

Oracle

The program is written in C++, UniDAC Component. But that's not the point.
When you try to connect from a working computer, the program connects and works.
When trying to connect from a virtual machine, the error "Socket error 10061" occurs, but the server responds to the ping command.
I also have my own Oracle on my work computer. And the program with VMware Workstation also can't connect I'm
using VMware Workstation

Answer 1

remove the firewall

Answer 2

Check tnsping dbname
at the command line. If OK, then the database is available.