I think the documentation may be a little scarce and missing some steps then.
How did you test this URL?
You need to send some extra informations at the Header, so TDM can give you a security token.
I use Postman to work with REST API's: Postman | Supercharge your API workflow
Postman works great to test POST methods.
How are you calling REST API?
Please ensure you have the correct format as specified in the Swagger API
I believe its REST GET call.
Also, the security token use to authenticate is valid 24 hours, so you have call API again to get a new Security Token after expired.
Try using swagger-ui that comes out of the box.
https://hostname:port/TestDataManager/swagger-ui.html
Ensure that the backend is working properly
If Self-signed SSL certificates are being blocked:
Fix this by turning off 'SSL certificate verification' in Settings > General
If Client certificates are required for this server:
Fix this by adding client certificates in Settings > Certificates
If Request timeout:
Change request timeout in Settings > General
By default SSL certificate verification is turned on. File>Settings and flip it off.
When getting your token from Postman, remember to READ the message at the side of the authorization field in Swagger. Postman just gives you the token. Swagger needs Bearer ****** (token) otherwise it doesn't work.
barra11, litda06, Peter.DeZutter, sanar03- are you able to help Prashanth?
I suggest opening a support case by going to http://www.ca.com/us/services-support/ca-support/contact-support.html.