Negotiate Protocol version...

[pietjuh89]

I've a problem with my vnc viewer/server 1.0.6.5.
My screen freezes, I disconnect and a connect again but it doesn't work.
The VNC Viewer Status is: Negotiate Protocol Version.

[Rudi De Vos]

Try to run in cmd on the server site first

netsh firewall add portopening TCP 5900 VNC enable

(this open the port in the ms firewall)

[pietjuh89]

I added the firewall rule. But it isn't still working. (The firewall wasn't enabled) When I restart the service it works. But I've VNC to reduce walking to my clients and servers.

[Rudi De Vos]

What's the OS ?
Are you using RDP and VNC simultanious ?

To avoid walking
Restarting a service can be done remote.
control panel/admin tools/ services -> action connect to remote

You only needed to restart the service ?
Then winvnc isn't complete death, else the restart was not able
to kill the hung winvnc.

[pietjuh89]

Hi,

I use Win 2003 R2 SP2. Server 1.0.6.5 and the videodriver. No further plugins.

Thanks for the tip to restart services remote.

[redge]

what is your network ? 100 or 1000 Mbits/s ?
if 1000 try to disable jumbo frame or jumbo packeet

[Rudi De Vos]

Vnc send packets of 8192 byte
I found this on the net.

-----------------
1.) The mtu for my network adapter is set to 9000.
2.) I can type "tracepath <ip>" and it returns a pmtu of 9000 to another computer.
3.) My buffer is 153600 bytes. So I need to send 18 (8192 byte) packets or 37 (4096 byte) packets.
4.) The rate at which data is being sent is 153600*60/second...so lots of data.
5.) Using the sendto command, I can send packets of size 576, 1400, 4088, and 4096, (and anything less than 1400) without many problems.
6.) I cannot use 4000, 8192, 9000,....and lots of others, except the above, when calling sendto or the program cannot keep up with sending and gathering data.
--------------

Anybody an idea...

[pietjuh89]

We've a gigabit network. Where can I disable jumbo frame or packet?

[redge]

We've a gigabit network. Where can I disable jumbo frame or packet?

Windows 7RC
Control panel... Network and Internet ...
Network Connections ...
Properties of Local Area Connection ... (Marvell Yukon 88E8053 PCI-E Gigabit Ethernet Controller (exemple)
Configure...
tab Advanced ...
select Jumbo Packet ... Value: 1514 (default); 4088; 9014 but you can found others value, in fact, this must match with the same value of Switch settings or/and remote computer network settings.


other work around too complicate for standard user and most leave for another remote control software product
this only for advanced user or programmer, is not yet available via uvnc_settings.exe

try winvnc 1.0.7.6.2
http://www.uvnc.eu/download/winvnc_32_10762.zip
and add/modify the new line of ultravnc.ini file (document) with notepad
and under part of [admin] add sendbuffer=8192

[admin]
sendbuffer=8192

To test 1 gb and other networks, you can play with the value
WIFI < 1500
LAN 4096/8192