Online Help
- Tips for speeding up Vista\Xp
- UltraVNC Driver - what is it, do I need it?
- Failed to get server address?
- File Transfer is disabled on the remote machine?
- How does UltraVNC work?
- How do I use SingleClick (first time users)?
- How to configure and use encryption with SC (SingleClick)?
- Mirror video driver and Video hook driver?
- How do I install UVNC as a service?
- How to install UltraVNC with remote desktop (RDP) ?
- Port forwarding NAT/router/firewall for any VNC flavor?
- What if i do not have a static ip for my WAN connection?
- Connecting to an office PC from home?
- UltraVNC step by step?
- Failed to connect to server
- VNC Password on the server
- VNC or any Remote Desktop is Unuseable over ADSL
- How to remote control my home computer over Internet
- Local loop-back connections are disabled
- Authentication failed
Failed to connect to server
This is a general error that indicate the server could not be
reached.
Possible causes
A) DNS name unknown
C:\>ping myserver
Ping request could not find host myserver. Please check the name and
try again.
CHECK DNS
B) The ip address is unreachble, no gateway defined
C:\>ping 167.27.36.65
Pinging 167.27.36.65 with 32 bytes of data:
Reply from 194.7.90.33: Destination host unreachable.
Reply from 194.7.90.33: Destination host unreachable.
Reply from 194.7.90.33: Destination host unreachable.
Reply from 194.7.90.33: Destination host unreachable.
Ping statistics for 167.27.36.65:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
CHECK GATEWAY
C) The ip is reachable, gateway ok, but server don't answer.
Is the server PC runnning?
C:\>ping 172.20.222.20
Pinging 172.20.222.20 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 172.20.222.20:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
CHECK SERVER PC's NETWORK
D) The server is online and can be reached
C:\>ping 172.20.222.166
Pinging 172.20.222.166 with 32 bytes of data:
Reply from 172.20.222.166: bytes=32 time=1ms TTL=255
Reply from 172.20.222.166: bytes=32 time<1ms TTL=255
Reply from 172.20.222.166: bytes=32 time<1ms TTL=255
Reply from 172.20.222.166: bytes=32 time<1ms TTL=255
Ping statistics for 172.20.222.166:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms
SERVER PC NETWORK IS OK
a) Is Vnc running on that PC ?
b) Is the server and viewer port the same ?
c) Verify if the port can be reached via telnet
Sample:
Server runnning on 172.20.214.2 port 5900
Wrong port answer
C:\>telnet 172.20.214.2 5901
Connecting To 172.20.214.2...Could not open connection
to the host, on port 5901
: Connect failed
correct port answer
C:\>telnet 172.20.214.2 5900
RFB 003.006
Connection to host lost. (timeout because telnet didn't
answer correct, normal)
If telnet works, but viewer fails. It could be
that your firewall ( like the buildin MS firewall) block outgoing
traffic based on application.
Telnet is allow, vncviewer is blocked.
Try to temporal disable the firewall to check this it.
For Windows XP/2003 or better:
Goto Control Panel, Windows Firewall and turn it off.
Try again to connect.
If it works, turn the firewall back on, goto the Exceptions tag and
"Add Program" (UltraVNC).
This needs to be done on both machines.
If this still doesn't work go back to the Windows Firewall and "Add
Port" 5900.
For Windows 2000 or before:
Consult the manual for your firewall and make sure that the port
5900 is unblocked.
Another solution is to make sure that your cable or dsl modems do
not have a firewall active in them. Speedstreams has a few models
like 5200, 5400 that some ISP have on by default.