VNC Authentication failure

I have problems accessing any of PC over RealVNC viewer 4. I’ve tried to connect to any of PC from different PC locations (It is still same internal network) and I have been receiving the same message: Authentication failure and tab for username is gray out so i coldn't sign in any username. When I’ve have tried to telnet with 5900 port I’ve received this message RFB 003.003, which implies that nothing wrong  with VNC server (I’ve changed almost everything on VNC server, It'sbeen reconfigured million times).It might have been related to our network but I don’t what is it?  
lontoursAsked:
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f-kingIT support technicianCommented:
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FrankcoCommented:
Hi lontours,

Can you add VNC to the exceptions in your Windows firewall?

Go to the control panel and click the Security Center ~ Windows Firewall ~ Exceptions
Click Add and browse to the C:\Program Files\RealVNC\VNC4\winvnc4.exe file.

Give it a try and let us know.
cheers,
frankco
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redlighttraitorCommented:
Ok, it's 2 things.

Either your firewalls are blocking or you're not forwarding ports.

OR

You're not configuring the right VNC server. Remember that there are two. VNC Server (User-Mode) and VNC Server (Service-Mode). Make sure you configure the one that you use or hell,just configure both of them.

You should also try pinging the host computer from the command prompt to see if that computer is even on the same network. It sounds stupid but might give you some ideas.
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cdesignerCommented:
Maybe problem in VNC, try another - TightVNC v1.3.6

with mirror driver for exapmple ( fastest available solution )
http://www.demoforge.com/dfmirage.htm
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mrroonieCommented:
i use the free RealVNC all the time at work - the free version doesn't require a user name. the easiest way to allow it through the firewall is to close the server and re-open it, this will bring up the windows firewall 'do you want to unblock this app' screen. choose 'unblock' obviously. For some reason every time you close and re-open the RealVNC server it wipes the password so you will have to re-enter it. It sounds like you need to re-enter the password for it
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