This is the sequence to set up the remote Linux debugging environment in IDA Pro.
1. Copy the linux server files provided by IDA Pro to the Linux system.
* The files are "linux_serverx64" and "linux_server" in the directory which IDA Pro is installed(Default : C:\Program Files (x86)\IDA 6.8\dbgsrv).
2. Execute the appropriate linux server file between the two files.
3. Select "Remote Linux debugger" in IDA Pro.
4. Click "▶"
5. Fill in the blanks as above image.
6. Click "OK"