The manual process includes the URL: Manually applying connector updates using the CMC interface - which is downloads.solarwinds.com. That said, SolarWinds uses akamai for downloads (which is why you're seeing the connection out to akamai), so for the IPs we'd have to rely on them. Unfortunately, akamai doesn't publish the IPs, so your best bet is to use downloads.solarwinds.com, or you'll have to find and allow essentially ALL of akamai's owned IP addresses (which is apparently upwards of 200k IPs!).
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