Hi guys,

Does anyone know why a REST API call to salesforce end up to "503 Service unavailable"?

Following is the error message sent by salesforce to our application:
15:18:14,914 WARN [org.springframework.web.client.RestTemplate] (default task-11) GET request for "https://na30.salesforce.com/services/data/v23.0/chatter/users/me" resulted in 503 (Service Unavailable); invoking error handler
15:18:14,929 SEVERE [com.silanis.esl.web.exception.mappers.ThrowableMapper] (default task-11) No error details from Salesforce.: org.springframework.social.UncategorizedApiException: No error details from Salesforce.
at org.springframework.social.salesforce.api.impl.SalesforceErrorHandler.handleUncategorizedError(SalesforceErrorHandler.java:60) [spring-social-salesforce-1.1.7.1.jar:]
at org.springframework.social.salesforce.api.impl.SalesforceErrorHandler.handleError(SalesforceErrorHandler.java:28) [spring-social-salesforce-1.1.7.1.jar:]
at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:566) [spring-web-3.2.13.RELEASE.jar:3.2.13.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:524) [spring-web-3.2.13.RELEASE.jar:3.2.13.RELEASE]

Thanks,
Andry