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Issue with communicating with the One Click Support server (ZeroWindow problem)
Basically this is the same as what I reported in this thread but with a better title and more specifics in an attempt to get someone's attention who can look into this.
If I try to use One Click Support it simply times out. I traced the problem to being unable to connect to the One Click Support Symantec server, https://tificocs.symantec.com/
Using a packet sniffer I'm seeing all kinds of weird stuff when One Click Support tries to connect to that server.
First off the server doesn't respond for 19 seconds after ACKing the client's initial "application data" packet. This results in the client issuing a RST.
Second on the second try, when the client starts sends a bunch of application data to the server, the server ACKS it all and then sends one duplicate ACK. At this point it starts sending out ZeroWindow notifications which means that it can no longer except packets from the client. Shortly later it sends an "ENCRYPTED ALERT" packet and then a RST to disconnect. This process then repeats and the One Click Support client gives up.
It does the every single time I try to use OSC. I have no idea why, but it would seem to indicate a server problem.
What's strange is that I can connect to https://tificocs.symantec.com/ using my web browser at work and receive a web page that contains the word "Forbidden", but when I try to do so from home the server immediately closes the connection without returning any data at all. I also tried a few SSL proxy servers and some return "Forbidden" and some simply show the connect being reset.
I'm not sure why it works for some people at not others or why I can connect to the web site from work and through some proxies, but not at home or through others, unless it is related to MTU or RWIN or something.
I have the packet dump of the entire connection attempt if someone at Symantec wants to get in touch with me. I also have dumps of me going to https://tificocs.symantec.com/ via a proxy server and directly.Message Edited by Morac on 09-10-2009 10:23 PM