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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?  
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