uppercase and lowercase letters (hotspot)

Good afternoon friends!
I really need the help of this community.
I have an RB in my work where I created a hotspot authenticating to a Radius Windows Server.
I set it so that the user did not log in simultaneously on two devices, performed a test and it worked perfectly.
This week I noticed a problem. Eg when I log in to a device using michael.jackson lowercase letters, and if I try to log in to another device using michael.jackson, the hotspot page states that I can’t connect two devices at the same time. Now if I put Michael.Jackson, the login is done and the navigation works. Can someone tell me how to solve?

Someone please

Tell your radius server to accept lowercase characters for username only.
I did this for freeradius, no idea how to configure MS radius.

Hello my friends, I was able to solve my problem by inserting this into the login.html file of the hotspot page.

pattern=“[a-z.\s]+$” title=“Only lowercase letters between a and z” placeholder=“Password”>

Thank you all!

Note this is not bullet proof as client can ignore it.

There is no way to ignore it, friend. It works in the same way as a registration you do on a Bank website: “If you do not meet the requirements where there is a red * I will not go to the next page”

Hu? The html form is just a hint what the server may expect.

If you want to try… Take Firefox, open the page, right click, select “Inspect Element”, edit page and send what ever data you want.
That works with every browser one way or another.

I hope your bank does server side checks for their input fields.