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1. Turn on USB debug mode in my phone >settings>applications>development
2. Connect the phone to computer via USB
3. Allow Windows to load drivers
4. Disconnect phone from USB
5. Turn off phone's USB debug mode
6. Reconnect USB between phone and computer
7. Successfully connect with Kies via the USB
The key here being: Have the phone in USB Debug mode when connecting to the computer to automatically load the drivers via the Windows Recognized New Hardware Wizard. Then disconnect and turn off the phone's USB Debug mode before reconnecting to the computer and Kies.
Now I put the "[?]" in my subject line because I have the confidence level of approximately zero with Kies at this point, woindering if it will connect the next time [smile] Hope this helps! - David
1. Turn on USB debug mode in my phone >settings>applications>development
2. Connect the phone to computer via USB
3. Allow Windows to load drivers
4. Disconnect phone from USB
5. Turn off phone's USB debug mode
6. Reconnect USB between phone and computer
7. Successfully connect with Kies via the USB
The key here being: Have the phone in USB Debug mode when connecting to the computer to automatically load the drivers via the Windows Recognized New Hardware Wizard. Then disconnect and turn off the phone's USB Debug mode before reconnecting to the computer and Kies.
Now I put the "[?]" in my subject line because I have the confidence level of approximately zero with Kies at this point, woindering if it will connect the next time [smile] Hope this helps! - David
1. Turn on USB debug mode in my phone >settings>applications>development
2. Connect the phone to computer via USB
3. Allow Windows to load drivers
4. Disconnect phone from USB
5. Turn off phone's USB debug mode
6. Reconnect USB between phone and computer
7. Successfully connect with Kies via the USB
The key here being: Have the phone in USB Debug mode when connecting to the computer to automatically load the drivers via the Windows Recognized New Hardware Wizard. Then disconnect and turn off the phone's USB Debug mode before reconnecting to the computer and Kies.
Now I put the "[?]" in my subject line because I have the confidence level of approximately zero with Kies at this point, woindering if it will connect the next time [smile] Hope this helps! - David
tried this, but now for some reason my computer claims it cant find the drivers so cant install them, really starting to get to pee me off now lol. says it cant find the software it needs
I have an addition to DavidWOT's post: try disconnecting your phone and using the connection troubleshooter in Kies (you can find it under Tools/Troubleshoot connection error). For me, this ended up uninstalling the drivers for my phone so that when I connected it again - in USB debug mode initially - it reinstalled the latest drivers that came with the latest Kies update. After rebooting my PC (Windows 7/64) and taking my phone out of USB debug mode, it can now sync with the latest version of Kies.
Hi,
I tried every other option mentioned in this thread. Especially, what David suggested. However i am still not able to connect my S2 to my laptop. I am really disappointed and would appreciate if any of you could suggest a solution to this.
Thanks,
Gokul
@awiseman - Thanks mate..I tried what you mentioned in your post and it worked. I was able to connect my S2 using KIES and even backed up the contents. However, when i got connected i saw that there was a new firmware upgrade available. When i tried upgrading it said "downloading firmware upgrade components" and after completing 3% of the download it said failed to upgrade, unexpected error occured.
Any idea what that could mean?
@wiseman - Actually i am not upgrading through wifi. I am doing it using my laptop. However i overcome this issue by just following your earlier post once again. I just disabled the antivirus and it downloaded the firmware upgrade components. But now the firmware is not getting updated as it says "Firmware update stopped working". I am not sure what has happened. Any pointers on this would be appreciated.
Thanks!!!
This is an annoying issue for sure, but thankfully easily solved:
- If your phone is plugged into your PC via USB, unplug the USB cable.
- Go to Settings>Applications>Development and untick USB debugging
- Reconnect to PC via USB
- You should now be able to connect to Kies on your PC
Cheers
Paul
Hi Ivan,
Even i got the same error. Not sure what means. Hope someone gives us a solution to that.
Cheers,
Gokul

Windows error messages are notoriously vague and difficult to interpret. If you can get either a screen grab of the message or paste the relevant entry from the Event Viewer here we may be able to work out what's failing.