Error: KDC reply did not match expectations

Question

I was facing issues while joining a machine to domain using below command. the server has OS as Almazon Linux 2 server which has to join to example.com.

I have done all the prerequisites which are required for Domain joining process for Li Below is the command i tried.

sudo realm join -U <username>@example.com dc01.example.com -v

O/P:

Could not get kerberos ticket: KDC reply did not match expectations

Solution

I have read some blogs & got to know simple mistake i was making:

Corrected command:

sudo realm join -U <username>@EXAMPLE.COM dc01.example.com -v

Using domain name in Capital letters resolved above error.

Comments

[Admin]

Why is this even a thing!? Case sensitivity like this is weird.