One-way connection only; Connection timed out in other
JAldrich "at" covista.com
Fri Apr 28 22:18:00 2006
Have you disabled Remote Desktop? That causes problems as well. Just
> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
> Behalf Of 9v43thv02 "at" sneakemail.com
> Sent: Friday, April 28, 2006 4:49 PM
> To: vnc-list "at" realvnc.com
> Subject: One-way connection only; Connection timed out in other
> First: I'm running VNC (4.11) internally in a private
> network. While all nodes are connected to the same
> switch/router which connects us to the Internet, we are not
> going out to the Internet to make these connections; they are
> direct, within the same network segment. I just wanted to
> clarify that, as I see a lot of Q/A related to Internet/NAT
> problems, which is not my case.
> Okay! Well, here is the setup:
> Server: WinXP Home SP2
> Viewer: WinXP Pro SP2
> User-switching disabled on both (i.e. oldstyle logon screen)
> Network: 172.16.0.0
> Router/Switch: SMC Barricade. I have also tried using a
> simple, ordinary, hub (3Com), to eliminate the possibility
> that switching, routing, firewalling, etc., could be at fault
> The server has Trend Internet Security (PC-Cillin), and both
> have WinXP Firewall, BUT I have disabled all firewalls for
> troubleshooting, including the one on the router. I have
> looked at all of the firewall logs on both computers, and
> have seen nothing realated. I have also tried disabling the password.
> I am able to initiate a connection from the Server to a
> listening Viewer, but cannot reach the Server (running as a
> service) from the Viewer. I can ping each computer from the
> other, so routing is working. When sniffing (using Ethereal)
> on the Viewer, I can see lots of traffic back and forth
> between both computers (browse, SMB, ICMP, etc). When I
> initiate a request from the Viewer, I see it go out (on port
> 5900 - and I have tried other ports as well - ), but no
> answer. If I initiate from the Server, I see the handshake go
> through, and all connects with no problem.
> Here's an odd thing : I was initially getting "Connection
> timed out" messages, and my sniffer was showing one-way
> requests (SYN) only, but after initiating the successful
> Server-side connection, and then disconnecting, my
> Viewer-side connection produced a SYN (Viewer to Server),
> then SYN, ACK (Server to Viewer), then ACK (V-S)... THEN...
> FIN, ACK (S-V), ACK (V-S), FIN,ACK (V-S), ACK (S-V) and,
> finally, a message box shows up saying "Connection Closed"
> (or "terminated", or something like that... can't remember...
> Final oddity: VNC used to work before, between these specific
> computers, running the same OS'es, configs, etc., and
> suddenly stopped working without any apparent cause. It's
> been a while since then, as I haven't had time till now to
> look at it carefully, but I really can't think of any sorts
> of system changes that could have had these results (but my
> memory may be playing tricks!). I am pretty much the "System
> Admin" in this house (yep, home setup). The Server is our
> family computer, but no one is allowed to do any system
> changes (no one ever does) or install anything without my
> involvement/approval. The Viewer is my personal computer, and
> NO ONE uses it; it's locked down tight.
> Well, Sorry for rambling on so long, and I hope I provided
> enough info!
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