Why doesn't Firefox Sync work in my home network, but at work?

Firefox Sync on my laptop does not work when my laptop is connected to my home network, but e.g. if I'm at my office.
The internet connection at my home is fine, I can surf the web with that very Firefox on both IPv4 and IPv6, DNS etc. is also working. Logging in to accounts.firefox.com also works, as does connecting Firefox to the Sync account. Only the process of syncing itself fails. On my desktop computer at home, I have exactly the same problems. When I open https://sync-209-us-west-2.sync.services.mozilla.com/ in a browser tab, I see a confirmation message that sync runs on that server, so apparently the network path between my computer and that server is free.
Upon investigation with Wireshark, I see the successful TLS handshake, then some packets from the client that are not answered and after some time the server closes the connection (Encrypted Alert). Apparently, no content is transferred between client and server. I attach a screenshot of how Wireshark sees the conversation between server and client (The image upload here didn't work so I put it on the web: http://ibin.co/1zXABHKdj5mA).
To exclude a possible misconfiguration or bad add-on, I created a clean new Firefox profile and connected it to my Firefox account, but this shows exactly the same problems.
Fun fact: Firefox on my Android phone does sync in my home network.
Below, I will link two log files, one successful sync (office network) and one failed sync (home network):
Sync @ office: http://pastebin.com/rZmfrbdL
Sync @ home: http://pastebin.com/a3KUCevJ

Any chance you are on a DS-Lite network at home? If so, what's your ISP? The home network symptoms look a little like https://bugzil.la/1118958

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