Sometimes we might need to increase the download speed for different downloads such as files, torrents etc. On windows based systems to prevent rapid spreading of malwares from system to system microsoft introduced a limit to restrict half-open TCP connection limit to maximum of 10. This results in windows not to have more than 10 concurrent half-open outbound TCP connections. New connection attempts are put in a queue and forced to wait. Due to this speed of connection to other PCs is limited.You can change this configuration to your desired value in tcpip.sys file. The tcpip.sys file is a binary file hence require tool to do this. By increasing the half-open tcp connection limits, the tcp connection to remote pc becomes faster. make sure you use this feature carefully as your system might become target to malwares. Hence modify this configuration with all the necessary security measures( security softwares installed and configured )in place.The popular tool available to do this is available here.
Root user login in gnome is disabled on Debian system by default for security reasons. If you want to enable it for specific reasons then follow the below steps : 1. Login into Debian system 2. launch the Root Terminal from Applications -> Accessories. 3. Authenticate with password to launch the Root Terminal. 4. Open "/etc/pam.d/gdm3" with vi. #vi /etc/pam.d/gdm3 5. Look for "auth required pam_succeed_if.so user != root quiet_success" , comment it out as below. #auth required pam_succeed_if.so user != root quiet_success 6. Save the modification with Esc+w+q+Enter keystroke. 7. Restart or reboot Debian system. 8. Login with root user in gnome. You should be now able to login successfully.