How is the code to the first keypad door in System Shock supposed to be found?

Solution 1:

The code is in the first log you receive.

Solution 2:

Just to point it out, the answer to this is in the following Log :

2-4601-06.May.72
Sender: #2-4601

On page 3, there's an actual error/typo by the developers (or a translator) that explain why people might not notice the code. The sentence is written as "First off, the combo to the healing suite is 451." instead of "First off, the code to the healing suite is 451." The way the text is shown in this game isn't great when you try to find keys words that could give you an idea of what to do. That mixed with typing errors makes it harder on some players.