Hello!
Let me introduce myself: this is Alejandro J. Medina. I live in Calgary, AB. I graduated in Information Systems engineering from Universidad Católica Andrés Bello in Caracas, Venezuela.
I specialist in Linux operating systems and open-source technologies, mainly in Red Hat and Debian-like. I have achieved three Linux certifications: LPIC-1, LPIC-2, and Novell CLA 11. See my resume to get their verification codes.
My Canadian work experiences are:
1. Canadian Pacific Railway: Linux administration for eChannel project.
2. Cenovus Energy Inc.: DevOps Linux specialist.
See my profile to review my experience and skills.
Back to your issue, it might be the SSH keys if you're using password-less authentication and there were recently changes on your servers. Let me take a look at it to solve the problem.
Please feel free to ask as many questions as you need.
Thanks!