Based on our tech support expert, Joe Stark's, interaction with some of our users, here is his compiled list of solutions to questions he encounters:
1. Firewall/Security software could block CrossLoop or VNC files from running or accessing the internet which can cause many problems including the following symptoms;
to launch the VNCViewer on the computer accessing the contact’s desktop to
display after the user ‘sharing’ their computer clicks on the Allow button on
b. Error message "Failed to Execute the Command Line: winvnc.exe" This message could appear on the computer that is ‘sharing’ and indicates that something is blocking TightVNC files from running. This might also happen if the user does not have Admin rights on the computer in the ‘share’ mode.
message "Failed to connect to web service." This message indicates
that something is blocking the file CrossLoopConnect.exe from accessing the
internet or on very rare occasions the CrossLoop server could be experiencing a
To prevent or remedy the above problems please configure your Security software to “Allow” CrossLoopConnect.exe, WinVnc.exe and VncViewer.exe to run and access the internet. Some security software might list groups of programs to allow or block. The CrossLoop, TightVnc, Remote Control and VIPTunnel groups should be allowed.
2. If either or both of the computers have a VNC program already installed it could conflict with CrossLoop.
CrossLoop installs and uses TightVNC which will conflict with any other VNC software if installed on the same computer. All VNC programs use the same registry keys and could overwrite each other’s settings. If you are being asked for a password from a VNC dialog box when trying to run CrossLoop, it is not a CrossLoop message. The best thing to do is to uninstall CrossLoop and the other VNC program on your computers and start fresh with CrossLoop.
3. You must be logged in as a user with Admin rights.
CrossLoop installs and uses TightVNC which must be able to write to the Windows Registry and to a configuration file. You must be logged on as a user with Admin rights to install and to use CrossLoop. If you do not have admin rights you will receive the error message “Failed to write to config file”.
4. CrossLoop disconnects and closes the VNC Viewer.
Crossloop does not have a time out period.
These are the known reasons CrossLoop would disconnect in the middle of a session;
a. The helper, "Access" end minimizing the VNC Viewer for more than 1 minute. This is a characteristic of Tight VNC that we can't do anything about.b. One of the computers going into Hibernate or sleep mode after being idle for the set amount of time.c. Some screen savers might cause CrossLoop to disconnect when they come on. Windows screen saver will cause it to disconnect if you have it set to "Display welcome screen on resume"d. A prolonged interruption in internet connectivity on either end of the session.
5. Computers that use a Proxy server to access the internet present a problem for Crossloop performance.
and normal, connection for CrossLoop is a Peer to Peer connection in which data
is transmitted directly between the two computers having a session. If you use
a proxy server a Peer to Peer connection is not possible so obviously,
CrossLoop performance will not be as robust as with a Peer to Peer connection.
When possible, you should have a direct connection to the internet when using
6. UAC on Windows Vista
According to Vista's Help file: "User Account Control (UAC) is a feature in Windows that can help prevent unauthorized changes to your computer. UAC does this by asking you for permission or an administrator password before performing actions that could potentially affect your computer's operation or that change settings that affect other users. When you see a UAC message, read it carefully, and then make sure the name of the action or program that's about to start is one that you intended to start."
Unfortunately, this message and request for approval
displays even if you are logged in as a user with Admin rights. When this
message is displayed CrossLoop is immediately disconnected.
A workaround for this problem is to turn off User Account Control when using CrossLoop. To do this go to; Start button/Settings/Control Panel/User Accounts and Family Safety/User Accounts/Turn User Account Control on or off. You will need to restart the computer for the change to take effect.
Good Afternoon and Good Luck!