In case anybody needs the solution.
I've also got the same problem today, while inspecting SSL traffic for my network with Squid. Here are all the subnets allocated to their AS:
162.125.0.0/16
45.58.64.0/20
108.160.160.0/20
185.45.8.0/22
199.47.216.0/22
Don't route traffic to these destinations through your SSL inspection proxy and sync will become green again 🙂
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