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Sruthi Pamujula 1 Unable to tunnel through proxy. Proxy returns “HTTP/1.0503 service unavailable Call ID: 218790656
Our Application is up and running last one year. Since yesterday, we started noticing this issue intermittently on majority of our controllers in production. The exception type is "System.CalloutException" in our exception logs. It is very intermittent and randomly appearing. We checked on our Internal API's. Our servers don't even receive request when this happens. Anybody faced this issue? think of any changes last 2 days from SF.
What we found out is that this is a firewall issue where your web service is hosted. When a request to the web service is made from Salesforce, it expects the response returned by the web service to come from the same IP address as when the request was made. In our case, our IT had configured the firewall so that incoming request was going through one IP address, but outgoing response was going through another IP address. Definitely, check with your IT to figure out a solution. One possibility is to put the server hosting the web service outside of the firewall.
Please mark this as solved if it helps.
Best Regards,
Nagendra.P
Did you find out the problem? We are having the exact same issue. We arent seeing any traffic to our external firewall when this exception occurs.
Thanks
Simon