VNC software investigation questions

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VNC software investigation questions

Postby jamielee6763 » 2018-04-13 16:36

I'm looking to find out some questions about UltraVNC. Our business is currently using TightVNC for remote access to servers and I'm looking at if that is still our best choice or if we should be changing to another software possibility. Here are some of the issues and requirements that would be required. I know some of the answers for UltraVNC from the site but some others aren't as clearly answered.

1. Can a TightVNC client connect with an UltraVNC Server installation and be functional? If we do change, we would like to have backward compatibility to what we already have deployed.

2. How dependable and fast is the file transfer with UltraVNC?

3. One of the requirements is the ability to implement domain authentication. I see UltraVNC has this ability. How well does that operate in separating the Full Control and View Only groups?

4. What level of encryption does UltraVNC have?

5. Does UltraVNC work with multiple OS? Specifically Win7, Win10 and Linux.

Thank You.
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Joined: 2018-04-13 16:22

Re: VNC software investigation questions

Postby mhertz » 2018-04-15 19:48

Sorry, can only answer some of your questions, but i'm sure others will chime in additionally :)

I've done alot of testings and research, and imho, ultravnc is the premiere vnc solution for windows, hands down. Tightvnc made great leeway with the tight encoding, but Rudi and Sam with vdacc and esvnc, later ultr@vnc blew anything else away on win32 platform from then on till now :)

Unfortunately, it is windows only, but viewers on all platforms can connect to ultravnc fine through the standard VNC protocol. I cannot say how dependent the file-transfer is on windows, as never used it(I use ssh - cygwin on windows, for both file-transfer(scp) and encryption). From linux you can use any viewer, but I recommend the viewer from ssvnc from Karl Runge - it supports most of the special things ultravnc supports, like encryption, chat, filetransfer, mslogon etc. Note, I haven't tested if the file-transfer actually still work - ssvnc isn't developed anymore for several years, so things in ultravnc could have changed so making file-transfer not be compatible anymore.

Yeah, ultravnc works with all your required windows versions.

The encryption supported i'll paste the info provided from the ultravnc encryption plugin's page:

Default configuration uses 2048-bit RSA keys and 256-bit AES keys.
RSA public-key cryptography supports 512-, 1024-, 2048-, and 3072-bit keys.
Configurable choice of symmetric ciphers and keys:
AES: Supports 128-, 192-, and 256-bit keys.
Blowfish: Supports 56-, 128-, 192-, 256-, and 448-bit keys.
IDEA: Supports 128-bit keys.
CAST5: Supports 56- and 128-bit keys.
ARC4: Supports 56-, 128-, 192-, and 256-bit keys.

Edit: Just tested, and ssvnc works nicely with ultravnc file-transfer. Note, on non-reparenting WM's like ratpoison and dwm, I had to first run: "export _JAVA_AWT_WM_NONREPARENTING=1". I used JRE7-openjdk to test with, as lightest JRE for my distro. Either use it direct from ssvnc(the GUI frontend), or do like me and use just the ssvncviewer(or ss_vncviewer for ssh/ssl), and run with:
"ssvncviewer <IP/host:port> -env SSVNC_ULTRA_FTP_JAR=/usr/lib/ssvnc/util/ultraftp.jar".
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Re: VNC software investigation questions

Postby jamielee6763 » 2018-04-19 17:56

So I have started testing the functionality of TightVNC to UltraVNC configuration. That is both Tight VNC Viewer to Ultra Server and Ultra Viewer to TightVNC Server. I have two issues, but will ask the most basic one here though. When I'm connecting, it should go directly into the session that the person is working on, but I'm having the issue that after it is connecting, it is treating it more as an RDP session and requiring the cntrl-alt-delete to log in. What setting am I missing that would let it go directly into the active session and ability to view what the logged on user is doing?
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Joined: 2018-04-13 16:22

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