One of our clients uses a rather strict firewall to restrict acces from external systems. We are trying to send data to one of their soap endpoints using apex.
This Stack exchange answer helped to get the IP adress of my requests like so:
HttpRequest req = new HttpRequest();
req.setEndpoint('http://icanhazip.com/');
req.setMethod('GET');
Http httpReq = new Http();
HttpResponse res = httpReq.send(req);
System.debug(res.getBody());
From 4 different orgs (2 scratch, 1 sandbox and 1 prod) a retrieve very different ip adresses (even betweens the requests), that are far away from the ranges inside this list. The sf instances are in Sweden or Germany, but the ips do not even apear outside the RIPE range.
Is there a chance, that this list only contains the IPs the salesforce webservers are linked to, but not to the apex servers in their cloud systems?
paloaltonetworks seems to maintain some SFDC lists with ip-ranges and domains but I wonder if domains do cover the apex server ips.
How shell we ask the client to open up their firewall for our requests, does it make sens to open up the domains instead or are they also just linked to the web servers? Any hint is appreciated!
