And don’t listen to the promises of big companies with billion-funds, they cook with water like the rest of us.

Oh, yeah, I remember when one of our super important core systems was migrated to SaaS. My system was interfacing with it, so I got notified about the migration to make a plan. I basically told them: “We’re using $API to connect to your system. Tell me the new hostnames and IP ranges and ports and I will configure the firewall on our end. Also, our connector for your migrated system will be deployed in $IP-range so please allow these inbound connections in your firewall.”

Half a year later I got a message: “Yeah, we just found out, that $SaaS-provider never configured the firewall after our tickets and everything is reachable from the public internet. We’re forcing them to lock down the system now. Can you please tell us again from where you connect to us?”