mitchell852 opened a new issue #5341:
URL: https://github.com/apache/trafficcontrol/issues/5341
## I'm submitting a ...
- improvement request (usability, performance, tech debt, etc.)
## Traffic Control components affected ...
- Traffic Ops
- Traffic Portal
## Current behavior:
Changing the CDN for a delivery service returns a 403 with
```
{"alerts":[{"text":"Forbidden","level":"error"}]}
```
## New behavior:
This needs to be a 400 Bad Request instead with a message like:
```
{"alerts":[{"text":"Delivery service CDN is immutable","level":"error"}]}
```
## Minimal reproduction of the problem with instructions:
Navigate to a DS in TP and change the CDN value. Save.
## Anything else:
If the intent is to make CDN immutable on a DS, the cdn field of an existing
DS should be disabled as well to prevent the user from changing it.
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