Hello Everyone,

We are making an Outbound call from Salesforce to the external system and getting below error.

Error: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 503 Service Unavailable

When we try to send the same request from Postman it is working as expected and getting a response. - From the same Org, they were other Outbound calls that are working fine.

We have tested with salesforce, they are saying to whitelist IP ranges, which contains 1,52,000. This is not possible to whitelist this much IPs at third parties end. Please suggest and help to resolve the issue. We have tested it woking fine in Spring 20 version but Summer 20 its not working.
 

Hello Everyone,  We are making an Outbound call from Salesforce to the external system and getting below error.   Error: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 503 Service Unavailable   When we try to send the same request from Postman it 

Hello Everyone,

We are making an Outbound call from Salesforce to the external system and getting below error.

Error: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 503 Service Unavailable

When we try to send the same request from Postman it is working as expected and getting a response. - From the same Org, they were other Outbound calls that are working fine.

We have tested with salesforce, they are saying to whitelist IP ranges, which contains 1,52,000. This is not possible to whitelist this much IPs at third parties end. Please suggest and help to resolve the issue. We have tested it woking fine in Spring 20 version but Summer 20 its not working.
 

Hello Everyone,  We are making an Outbound call from Salesforce to the external system and getting below error.   Error: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 503 Service Unavailable   When we try to send the same request from Postman it 

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