Hello @ArchanaE,
Sorry for the inconvenience it seems is more related to AWS connectivity issues as @hawraa.salami explained in this post. I couldn’t reproduce the issue but could you try troubleshooting with this video to allow All TCP. Then try to connect to the instances (particularly thede-c2w1a1-bastion-host same like you did in the video for de-c2w1a1-external-bastion-host). Another thing to note in the PC settings you could turn on “set time automatically” and “set time zone automatically”. Thank you