Hi Walter, I’ve been trying this for the last days (transparent proxy, no cache), and tcpdump to capture packets.
Got the same message retrying the download of a ~14GB game (letting a few seconds between retries). The game downloaded fine without the proxy.
This happened once (with 2 consecutive retries), but after that all other steam downloads through proxy went fine (~100GB or more).
Unfortunetly I didn’t thought about tcpdump until it was too late, therefore no dump of failed download (not saying that I could interpret the dump but someone else might.)
Sorry, I know this does not help you much with the problem. Just in case, today I might give it another try.
@filippo_carletti, do you think a packet capture could help to discerne if it’s a proxy problem or a network one (steam servers, response delay…) ?