CORS connection error in WebApplication

Kinetic ERP
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1

Hi all,

I am creating a web application through Claude.ai, and I want to connect to the REST API here so I can get up-to-date data from Kinetic. I put the URL of the REST API, the USER NAME and PASSWORD with API KEY, but when I connect, I am getting the error **“Network error — possible CORS issue. Check Epicor API settings or try from a backend proxy.”

So I did research, and I got one Topic in EpiUser related to CORS that I have to edit: *“” In Web.config.

But we have the Kinetic Cloud web version 2025.2.16

Can anyone help with this would be really appreciated

2

With this web app, are you creating user accounts? Like are people signing in with their Epicor username and password?

3

Yes!

4

Are you fully qualifying the domain name as part of the appserver URL? I’ve fallen over that in the past.

E.g. https://myserver.mydomain.com/live

5

I highly doubt you are running into a CORS issue. That’s likely a red herring.

Show the code on how it is trying to connect, and we’ll get you straight.

6

Agree with Kevin. What does the app do? Are we sure that the CORS issue isn’t with the web app itself?

7

This isn’t CORS Epicor doesn’t care about CORS out of the box for REST endpoints.
What lange and framework is Claude using?