How to fix 'Argument-out-of-range-exception: Length cannot be less than zero, Parameter name: length' error in Entra connect.

Question

Hi, I'm doing a school assignment where I will migrate a server Azure using Microsoft Entra Connect, in VMWare. I keep getting this error 'Argument-out-of-range-exception: Length cannot be less than zero, Parameter name: length', and do not know what to do. It appears after I have put in credentials to Global Admin user in tenant, and it is trying to connect.

Tried troubleshooting on the internet but couldn't find something this particular problem. And I am also really new with PC, would appreciate all the help I can get.

Appended the log, in case someone understand some of what it says :)

Elin

error.jpg

errorlog.jpg

Answer 1

The error message indicates you have not properly set up your tenant for use with Entra connect. Go back to your tenant configuration and make sure everything is correct. The logs indicate it gets to the tenant and then fails when trying to read some of the tenant data because it is improperly formatted. Unfortunately a screenshot of the log doesn't allow us to see the actual error information. In general you should attach the actual log file rather than a picture, after you redact sensitive information.

So the tenant itself seems accessible but it fails when trying to read in the tenant data it needs. Specifically it says placeholder which leads me to believe you might not have fully set up your tenant yet.

Answer 2

Hey again, just wanted to say the solution was found. With the help from a friend I found out I had to skip the "create a tenant" part of the tutorials i have read. (And that my subscription came with its own tenant that I can use.)

Because of my Subscription (Azure for students) or license I can't choose 'Microsoft Entra ID' as a tenant type, and therefor chose 'Azure AD B2C', and that does not work with Entra Connect.

So this was a good learning experience, in how important propper research is :)

• Elin Weidemann