Running W7. Teredo adapter will not install driver or after unistall will reload on reboot (it has a code 10 error under device manager). I cannot connect to through a VPN to an SAP program. The error is "192.168.100.201 cannot be reached)(code -10; 10035) Everything was find 3 weeks ago. The only software added was Micro Trend Ofiice Scan but I unistalled it...It will not connect on DSL or mobile broadband. When you ping the IP address to SAP it times out immediately. All other internet traffic is fine. I have had at least 10 hours of IT personnel trying to correct this issue with no luck. Any suggestions?

Hi, I suspect the VPN connection issue is not related to teredo tunneling adapter. First of all, I suggest you try System Restore to get back to a previous time point which everything worked fine. Due to you cannot ping to VPN, therefore the connection cannot be set up. What is your VPN server? Currently, we could try the following steps to check the result: 1. Disable the firewall and anti- virus software temporarily for test. 2. Perform a clean Boot to check how it works. For teredo tunneling issue, due to Teredo Tunneling is required to set up IPv6 enable, please check the IPv6 settings. Regarding how to enable IPv6, please refer to: HomeGroup get an error of must have IPv6 enabled Hope it helps. Alex ZhaoPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.