One-way connection only; Connection timed out in other direct ion.

[John Aldrich]

Have you disabled Remote Desktop? That causes problems as well. Just
checking. 

> -----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
> direction.
> 
> 
> Hi!
> 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!
> 
> Salutations,
>   -Paul
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