Why did the first attempt to send a LOGIN message over ARPANET fail?

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The first attempt to send a "LOGIN" message over ARPANET failed because the system crashed while the user was typing the letter "G".1

At the time, Charley Kline, a member of Leonard Kleinrock's team at UCLA, was attempting to log into the computer at the Stanford Research Institute. Although this initial effort was unsuccessful, the technical issues were subsequently resolved, and the network continued to develop as a foundational test bed for modern Internet technologies.1