The Jaradans are a reclusive, insect-like species that come from the planet Torona IV. They are very strict when it comes to protocol. Any mistake with their language is considered an insult.
The Federation attempted to make contact with them several times. In 2344, a slip in pronunciation of the greeting caused a rift between the two for 20 years.
In 2364, the U.S.S. Enterprise-D conducted a diplomatic mission to their homeworld. A probe disrupted the Enterprise-D's holodeck locking Captain Jean-Luc Picard in the holodeck.
He was successfully able to deliver the greeting. He honored the Jaradans and this allowed future communications between the two.