Mern stack Backend Session Error Troubleshooting

In our Mern stack app I'm facing a session error in my backend system, specifically on the authentication server. The type of authentication I'm using is session-based.

Ideal skills and experience for the job:
- Extensive knowledge in troubleshooting backend systems, specifically authentication servers.
- Proficiency in working with session-based authentication.
- Previous experience in resolving session errors.
- Strong problem-solving and analytical skills.