Either they tried sshd or they didnt. If they did try it, then they have a good response ready to go no matter how you ask. The issue here is if they did not try it. The longer they have worked on it, the more gently I would make the suggestion towards sshd. If they have worked on it for their whole life, I wouldn't provide any help unless asked to and only limited to what they have asked me to do. If they have worke…
It's about one being confronted with the possibility that some other unforseen solution could have saved days, weeks, or months of work (or even perhaps longer!) and the foolishness or incompetence that one might feel at not having realized this.
If there is a meaningful chance the alternative solution would have been better, and a significant amount of effort invested into the harder approach, it can be a very tough pill to swallow. The ego might reflexively jump in to defend the path that was taken. It may be difficult to have a productive conversation.