Gwyneth Butera

I see that you are using Gurobi 12.0.1. Can you try with 12.0.3 and see if that changes the behavior? Thanks!

Unfortunately, I don’t have access to Gurobi 12. I only have a license for Gurobi 10.As an Academic user, you should not have this restriction.

If by parameter you mean the coefficients in the constraints and objectives, I'd suggest that you also have a look at the articles  How do I diagnose a wrong solution? How do I diagnose a suboptima...

I asked our new AI tool Gurobot to answer your question. Here is what it repliedTo obtain dual unbounded rays in Gurobi for constructing feasibility cuts in two-stage optimization problems, you nee...

Here are some suggestions from our newly updated Gurobi AI Assistant Gurobot; maybe it gives you some ideas on how to diagnose the issue.This is a known issue that can occur due to several factors ...

Also, please see our KB article How do I diagnose a wrong solution? which provides a number of tips on how to troubleshoot this type of issue. - Gwyneth

To add to what Riley said, also please be sure the code itself does not have any Gurobi license details, such as WLS API keys. -G

Hi! Based on the email address for your account, it appears that you are located in China? If so, please contact the Gurobi reseller in China; see http://www.gurobi.cn/NewsView1.Asp?id=4 for furthe...

A related article in the Knowledge Base is Why does Gurobi report my model is infeasible when it has a feasible solution?

In addition to Jaromil's suggestion, please have a look at our KB article How do I diagnose a wrong result? for more suggestions.