Connection refused - time out error on port 443

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I am trying to install ros2 humble, but when I run the following command - sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o /usr/share/keyrings/ros-archive-keyring.gpg, I am getting connection timed out due to port 443. Some one please help me on this.

pans@pannaga-vm:~$ sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o /usr/share/keyrings/ros-archive-keyring.gpg
curl: (28) Failed to connect to raw.githubusercontent.com port 443 after 131005 ms: Connection timed out
pans@pannaga-vm:~$

Please I beg someone help me find a work around for this probem.