Hello,

I have a problem with calling the API REST on my Sandbox. The API calling stopped working sundenly. 

The API is working well on my live environment.

I tested the API using SoapUI and i have no problem with the live environment but the same problem with the Sandbox.

I checked every parameter (username, pwd, client id, client secret, the authorisation key and grant type) and always the same error.

I even tried with a different endpoint by replacing the test by the domain i see when i connect to my Sandbox (https://test.salesforce.com).

I also tried with a new fresh Sandbox. But always the same error.

Can you please help ?

Here's the request :
POST https://test.salesforce.com/services/oauth2/token?client_id=XXXXXX&client_secret=XXXXX&username=XXXXX&password=XXXXYYYYY&grant_type=password HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 0
Host: test.salesforce.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1.1 (java 1.5)


Here's the error i get : 

{
   "error": "unknown_error",
   "error_description": "retry your request"
}

HTTP/1.1 400 Bad Request
Date: Thu, 04 Aug 2016 10:21:00 GMT
Strict-Transport-Security: max-age=10886400; includeSubDomains; preload
Content-Security-Policy-Report-Only: default-src https:; script-src https: 'unsafe-inline' 'unsafe-eval'; style-src https: 'unsafe-inline'; img-src https: data:; font-src https: data:; report-uri /_/ContentDomainCSPNoAuth?type=login
Set-Cookie: BrowserId=tF38uGqgQseAw5QjqMIJaA;Path=/;Domain=.salesforce.com;Expires=Mon, 03-Oct-2016 10:21:00 GMT
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Pragma: no-cache
Cache-Control: no-cache, no-store
X-ReadOnlyMode: false
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked

{"error":"unknown_error","error_description":"retry your request"}