Our server, hosted in the US (Salesforce Instance), is integral to our Research and Development activities. Currently, we are working towards achieving Milestone 1 (M1) using Version 2 APIs from our US-based server, and unfortunately, we are encountering the following error:
“System.CalloutException: Unable to tunnel through proxy. Proxy returns ‘HTTP/1.1 503 Service Unavailable.’”
After consulting the developer forum, it became apparent that whitelisting our IP addresses is necessary to overcome this issue. Below are the IP addresses that we kindly request to be whitelisted:
- 3.225.151.145
- 3.225.240.254/32
- 18.204.28.162/32
- 18.211.105.61
- 34.197.58.108
- 34.204.111.166/32
- 52.3.16.30
- 52.22.251.194
- 52.70.135.185
Your assistance in whitelisting these IPs would be greatly appreciated.
Our sandbox client ID is SBX_004995 for your reference.
Regards,
Sandesh P
