打診 だしん発生 はっせい げん認証 にんしょうじゃなかったです
dashinhasseigennin shōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 打診発生源認証

1. Wasn't investigating the source.; Didn't check the origin.

Past/Perfective
Negative
Polite
Casual Register
Computing