thunderbird not connecting to Gmail

I think it would be helpful if you could offer a bit more information. I know you set up the account some time ago. What version of Thunderbird are you currently using ? What Anti-Virus product are you using? It would be helpful to provide the following: In Thunderbird * Help > Troubleshooting Information * Scroll down to the 'Mail and News Accounts' section * copy all the data in that section and post it into this forum. * OR take a screenshot and upload the image file. Are you having a problem getting new mail or sending emails or both ? When you click on 'Get Messages' what happens ? Do you get an error message? If yes: upload image of the error If you type the error message then it must be word for word verbatim. Have you enabled a VPN on the computer? Has your Anti-virus product auto enabled a VPN ? Some people have discovered their Anti-Virus updated and installed and enabled a VPN without their knowledge. Please Check computer for VPN and make sure it is switched off. Are you able to logon to your gmail webmail account via a browser? If yes, it proves that password works. Did you by any chance, logon to the gmail webmail account and modify/update your password or not? if yes, that update of password in gmail webmail account would effect Thunderbird and need all the password to be reset. So I need info to advise further.