It's likely that Frodo's putting on the One Ring played a large part in Gandalf being able to communicate with him. In Lórien, Galadriel knows exactly how many times Frodo has previously worn the Ring. Likewise, as soon as Sauron forged the One and wore it for the first time, the bearers of the Three Elven Rings were aware of him and his intentions.
Gandalf would have been able to perceive Frodo through his own ring, Narya. Similarly, Sauron came very close to discovering Frodo because he was wearing It, and because he was on Amon Hen. There are no other times when Sauron comes so close to sensing Frodo.
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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