Quotes from the Mailing list:

There is still one problem that prevents us from deploying the new
network test server image.

The problem only shows within the Digia network; I cannot reproduce it
locally. This makes it somewhat tedious to debug, if somebody from Digia
has more insights or wants to help debugging, I would be happy to hear.
So far I have sent patches to Tony, who applied them for me and pasted
me the results, which makes turnaround time quite long.

What I think the problem is: We get 2 Socks messages in 1 TCP packet, so
the read notifier only fires once, then we never parse the 2nd Socks
message.

–

Unfortunately the codepaste from the Digia test has expired; IIRC they
were the 2 responses to our Connect Command:

1. Results(V5): Succeeded, Address Type, Remote Address, Port
2. Command: Connect, Remote Address, Remote Port

So I think we need to make the our socket engine parse the 2nd message
as well, even without an explicit readyReady().