UltraVNC

This is a weird one! I have a friend with 10 computers in different locations. One of them has his book keeping program on it. And he needs to get at it from wherever he is at the moment.

I set up a repeater, and the system has been working perfect for years. Windows version agnostic.

But today ...

Here is the thread: https://forum.avast.com/index.php?topic=210715.0

AVAST has released an emergency micro-update to address this.

Details on the linked post, but its a one-liner. From an elevated command prompt, or RUN diaglog enter:

schtasks.exe /Run /TN "Avast Emergency Update"


Reboot is ...

Great. Curiously, I ran into this with another site. But was able to use ScreenConnect to reboot the machines and that seemed to fix it.

Very weird. Also after updating Avast.

But where in the Viewer GUI is the reboot commands? I know I have seen them someplace, but cant find them!

I remote support a bunch of PCs. My machine has 1.2.1.1, I think the other end does too. DSM plugin enabled for 1 target, not for the others, all using the repeater.

My machine is Win 7 PRO 64-bit, they are also Win 7 PRO 64-bit.

Has worked fine until today.

I updated Avast antivirus and rebooted ...

I'm trying to use ssvnc with uVNC server with SecureVNCPlugin64.dsm enabled and having a problem!

It connects, then hangs until timeout.

The ssvnc side says:


ultravnc_dsm_helper: got connection: 0
securevnc_setup: fail read rsabuf: n=0 len=12
vncviewer.x11: VNC server closed connection

2017/04 ...

Any news on this?

I'm trying to use ssvnc with uVNC server with SecureVNCPlugin64.dsm enabled and I'm seeing the same thing.

It connects, then hangs until timeout.

The ssvnc side says:


ultravnc_dsm_helper: got connection: 0
securevnc_setup: fail read rsabuf: n=0 len=12
vncviewer.x11: VNC ...

I'm working on debugging using ssvnc from my MAC with a repeater and DSM plugin.

I had no problem getting ssvnc to connect to this version of server direct over my local network.

Now I'm trying enabling the DSM plugin and try a local connect with that. I enabled debug logging on the server machine ...

However, I was able to use ultravnc with passwords longer than 8 characters. I really did.
I will look into this more because ultravnc was supporting longer passwords, I will try to find after which version this problem came to happen.
I have never used encryption plugin , so the support was ...

The original VNC protocol only allows 8 characters. I always wondered if it was somehow tied to the old DOS file length limitations...

Normally, it just ignores anything given or entered past that.

To use nice, safe, long passwords, enable the encryption plugin. The settings window for the plugin ...

Installed tied to two local IP ports (wired and WiFi) works fine. Encryption plugin is enabled. OS is Windows 7, all updates and patches.

As soon as I add "service_commandline=" to the INI file and restart the service it connects to the repeater. Then tries to connect again, gets an error, flashes ...

The Unix/Linux repeater stores the ID number of connected machines in an environemnt variable. Accessing that data is really hard.

A few years ago I tried to re-write the repeater into Python so I could easily database all the connection info. But there are so many undocumented hacks made to uVNC ...

You should direct your complaints to VS2010 for using - clearly - non-standard display API calls. uVNC will happily capture anything using the documented and approved screen calls.


You might be able to get it working with a different combination of settings, like:
- screen driver on, Syshook off ...

Aha!

I noticed that on a machine and was wondering what caused it.

Glad you figured it out! I'm so used to uVNC "just working" that this really threw me for a loop!

MiG wrote:Workaround is using a virtual win7 installation, but it sucks

Glad its not just me doing that!


And it does suck.

Rudi De Vos wrote: You can simulate this by moving the viewer window over the desktop borders
( forcing a redraw)

Ah, funny you should mention that. I used to drag around the "status" dialog to get it to update the window as it comes in. But that does not seem to work the last few revs.

The speed is the data send devided by a time to get it in /sec.
*no data send, no measurement


"Sent" from the Viewer? Which would be "received" by the remote server?

Which would explain why it stays blank until I get my initial screen.

Part of the problem is knowing if that initial screen is ...

I can connect to Apple OSX machines from Windows, but not the other way around - if I use the SC Plugin.

And "everybody" wants to use the plugin to get better passwords.

So I'm kinda stuck.

It would be really helpful to know what the SEND and RECEIVE speeds are to spot network problems before they become a show-stopper.

I usually have the "status" windows (icon is an "!" mark in an orange circle) all the time. But I have noticed - after the fact - some network problems were not ...

Could this be related?

http://forum.ultravnc.info/viewtopic.ph ... 5ab#p94344

Could this be related?

http://forum.ultravnc.info/viewtopic.ph ... 5ab#p94344

This might be related to another post where the initial screen nevers displays - you just get a solid colour window.

I have 50 or so machines, most use the FreeBSD repeater, some have local port forwards as well. (for when the auto reconnect fails I can remotely restart the service)

A few weeks ...

lwc wrote: ... how many bits of defense do I get?

Just popping around and I realized the info is on the Download page for the plugin:

Default configuration uses 2048-bit RSA keys and 256-bit AES keys.

https://uvnc.com/downloads/encryption.html

supercoe wrote:The hash doesn't help you if you don't know password.

ah, I could make a new password in uVNC then copy the hash....

Yeah, this cluster-F**k with the password - that I SET - made me feel just like him....

Like my new Avatar?


Check out http://www.mrbill.com


tape? whazzat? heheheh

supercoe wrote:Could we at least have an ultravnc.ini option to disable the PC speaker beep?

Default ON

Oh Noooooooo!

Mr Bill!!!


I was hoping it got recorded someplace in plaintext, or even as a hash when the compiler was run.

I think I know what machine I built it on.....

The server is SC. Where is the plugin's control panel there?


Ah well, the good news is the INI settings for the "winvnc.exe" server are usually in the same folder as the EXE (ultravnc.ini) and the plugin settings are controlled by a couple of lines in the admin section:


[admin]
UseDSMPlugin=1 ...

I'm sorry, I forgot to mention the viewer would use the plugin to access multiple SingleClicks. What does it take to enable the options and how many bits of defense do I get by default?

The plugin's docs don't mention that advanced option, which is why I ask in here.

Yeah, I tripped over it ...

:oops: :oops: :oops: :oops: :oops: :oops: :oops:


<sigh>

Somehow I have managed to loose the record of the password used when I compiled Chunk. Is it stored anyplace in either file set or a log I can dig it out of?

I don't mind recompiling, but I have already distributed the client side to a few ...

I've had this problem with Windows XP based laptops. Not only does the System Beep sound every five seconds, but the cursor changes to an hourglass and back to normal too. Task manager shows that InstantSupportVNC.exe is starting, stopping, starting, stopping...

I've taken to disabling the system ...