The consumed webservice needs to have SSL/TSL. (https).

If the target webservice is unable to expose itself secure, you can always fall back to use a component to make an unsafe webrequest, however this means that you won't be able to consume it automaticaly using Outsystems.

I made a component which tackles this (though it's for binary downloads, but you can look and change the code to fit your needs).

https://www.outsystems.com/forge/2763/

if the endpoint is actually using SSL, then the odds are that:

1. Your server does not recognize the certificate (and or its chain);
2. You are using the wrong name when calling the endpoint (needs to match the fqdn on the certificate);
3. The certificate on the endpoint is not valid (expired or revoked) anymore;
4. Your server and the endpoint do not agree with which protocol/version should be used (eg:  SSL2|3, TLS1.0|1.1|1,2);

You could use this plugin if your rest didn't use SSL

https://www.outsystems.com/forge/component-overview/2250/rest-ignore-certificates

But this is not recommended in production environment

Hi, 

Thanks very much for the reply's, but how i can import the methods to service studio using the endpoint?

Hi Fábio,

If your REST service is accessible only via HTTPS (not HTTP), then obviously the HTTPS connection must be secure, i.e. there must be a valid certificate present. If there is none, you cannot use the "Add all methods" button. Note that even if you create, like Toto wrote, the REST service "manually" (i.e. add a single method one by one), you still cannot call the REST service, as calling it will also require a secure connection if useing HTTPS.