A Merry Codemas

Your present is near, but not quite yet I fear,
solve my riddle below, a present it will bestow.

In a land of snow and code's delight,
Navigate with SSH, a digital flight.
Open Windows command prompt, start your quest,
"ssh -i keyfile ubuntu@this_server" is best.

This link, a file, an SSH key, quite grand,
Download, decrypt, as the instructions demand.
"AES256" whispers the winter's cold breeze,
Unlock with a password, crafted to please.

The password, a secret, hidden in verse,
First letters of each line, a poetic traverse.
Within this server, a 'flag' file awaits,
Its code, a present's fate it dictates.

In the app where water boils with ease,
Enter the code, fulfill the festive tease.
Warmth spreads around, like a holiday hug,
Your gift unlocked, a prebant for gug.