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Raheel IqbalRaheel Iqbal 

System.CalloutException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503

Please help me it's my humble request. I'm stuck on 5 days. I add server ip ranges but still not working. I follow this link:

http://www.salesforcegeneral.com/salesforce-articles/ip-whitelists-for-salesforce.html
Vladimir SaturaVladimir Satura
Try looking here: https://developer.salesforce.com/forums?id=906F00000008ju8IAA