I finished iptables task and clicked finish. It was working for some time so I clicked again on new task and new windows has been opened. I finished exercise again and clicked finish. It was working for a long time so I switch to previous window when I found out that finally my tasks has been finished successfully.
After few minutes I got time out on second window and in task window I see that my task has failed.
Below screenshot as I did it successfully. I hope you can correct it on the system
Thanks in advance