Jenkins failing to accept modifications made to existing pipeline job, unable to create new job

Using Jenkins version 2.375.1.

I have a Jenkins instance which seemingly all of a sudden, no longer is allowing me to modify the pipeline script for a specific job. When I click "Submit&qu开发者_运维知识库ot;, I get a ERR_CONNECTION_REFUSED. Other pipeline script-based jobs seem fine and are modifiable, it's just this one that's giving this response. Additionally, I seem to be unable to create any new jobs and save them, receiving the same ERR_CONNECTION_REFUSED when I try.