We help IT Professionals succeed at work.

VNC slow or lots of disconnects

SweatCoder asked
Medium Priority
Last Modified: 2009-07-29
We run VNC 4.0 on our WAN, and I connect to remote machines (500 miles away) through VPN and VNC. On some servers on our network, my vnc performance is just fine. It's tolerably fast and no disconnects. On other servers on the same network, it's either extremely slow, or drops my connection very frequently.

1- Is there a way I can troubleshoot this? If I could tell my sysadmin WHY this is happening, I'm sure he could fix it, but he has better things to do than spend all day troubleshooting vnc connectivity problems.

2- Is there a better/faster/more robust tool than VNC?

3- Any idea why some servers (one in particular), would be dropping my connection, on average, twice per minute?
Watch Question

Distinguished Expert 2019

1) If anything, you should probably do a traffic analysis of your network. So use a tool like Ethereal (http://www.ethereal.com) or PRTG (http://www.paessler.com/prtg) to capture packets and analysis traffic. If something like VNC of all things is having problems, chances are that something else is as well. You'd have to have access to a monitor port on the switch or else your analysis might not turn out so good. Network person might be needed for this if you're not him/her.

2) Remote Desktop if you're running Windows Server 2003.

3) See #1. Might be storm of traffic hitting certain servers or a bad link along the way. Traffic analysis would be the way to initially check... then start looking for other issues.


I like remote desktop because of the speed, but I don't like the layered connection thing. Is there a way to configure RD so that it puts you on "the terminal", like vnc does, rather than running in a background process?
Distinguished Expert 2019

Not that I'm aware of... but you could also try a different VNC-based product too. Like UltraVNC or TridiaVNC.
We have had very good luck with Gencontrol.  http://www.gensortium.com/products/gencontrol.html

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts


SpartanIT, I'm trying Gencontrol now. Seems okay, but very slow. Slower than vnc. If it keeps the connection more robustly, that's a good thing, but is there a way to improve performance on this?
Sorry, I've never had to tweak it.  It has always worked as is.  We have some sites that only have 64k connections that we use it accross, but none as far away as your 500 miles.


It's 1.5 MB/s on my side and T1 on the server's side. Anyways, I'll try this out, and if it doesn't drop me like vnc, it will be a great thing.

I'll  award points in a day or two, just in case I can get add'l input.
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.