You use USB Adapter instead of tethering [URL] turn ip6 off You could try disabling IP6 with Admin command prompt netsh interface teredo set state disablednetsh interface teredo show statenetsh interface ipv6 isatap set state state=disablednetsh interface ipv6 isatap show statenetsh interface ipv6 6to4 set state state=disabled undoonstop=disablednetsh int ipv6 6to4 show state netstat -b -o -a -r -n don't post results with addresses  
"Hullo World!" (My first post   How do I connect a Dell Optiplex 780 computer to a wifi hotspot? I have recently moved to an island where there is no NBN and no landline facility for connecting to the internet via a router.  What I have done - more-or-less successfully - is to tether to the internet through a Samsung Galaxy A11 phone, using a short USB cable.  Speed fluctuates a bit but at its best it is quite fast.  But at other times, possibly times of heavy internet traffic, either nothing happens; the computer just appears to freeze, or I get a red "NO INTERNET CONNECTION error message.  This can last anything from a few seconds to twenty minutes or more. Suspecting that a hardware element of the computer itself might be failing, I rang my computer repair shop and was told to: (1) go into Settings on the phone and change my username and password, then (2) set the same username and password on my computer. These two steps, I was assured, would result in no more trouble with internet connection. Today I took my (almost new) phone to the Vodaphone shop on the next island and an excellent techo there walked me through resetting the username and password on the phone and gave me step by step written instructions for setting the computer to match.  Unfortunately, when I got back to my own island I discovered that the small icon he told me to look for in the bottom right corner of my computer screen to start the process off is not there.    Following a MUCH earlier post on this forum, I looked in System/Device Manager/Network Adaptors and found the following:     avast! Secureline TAP adaptor v3     Intel (R) 82567LM-3 Gigabit Network connection     SAMSUNG Mobile USB Remote NDIS Network Device #2     Teredo Tunneling Pseudo-Interface (Driver version 6.1.7600.16385 (with an attached exclamation mark warning me that it could not be activated) None of these look like a wifi facility to me.  So I'm left thinking that as the computer is configured at present (either because of software or hardware limitations) it CAN'T be connected to the phone by wifi.  I hope I'm wrong.  I HOPE someone reading this can tell me I'm wrong, and how to make it work. IF the cause of the problem is a hardware limitation, is it possible to retro-fit this very familiar, serviceable computer with a wifi card (or something) so that it CAN connect to the internet via the phone without the USB cable? I'm running Windows 7 Professional and have strongly resisted "upgrading" to Windows 10 because of its arrogant, presumptuous, pushy invasion of privacy and constant attempts to over-ride local settings with stuff from/to "the cloud".  Also, I want to keep my CD/DVD player.  Current computers don't even seem to have the slots in their boxes to take one if custom fitted. Any help with solving this dilemma will be very much appreciated.  Thanks.  
How do I connect a Dell Optiplex 780 computer to a wifi hotspot?