![]() ![]() Firewall interference – It turns out that this error can also be facilitated by a restriction imposed by your firewall.If you want to connect your email account with Thunderbird or Outlook, the best course of action is to simply disable two-step verification. Two-step verification is enabled – As it’s been confirmed by several affected users, data syncing handled by Thunderbird is very unreliable if two-step verification is enabled.In this case, you will be able to fix the issue by accessing the settings menu of Gmail or Yahoo and allow less secure apps to sync data. ![]() Less secure apps are not allowed – In case you are encountering this problem with a Yahoo or Google email, keep in mind that communications might be blocked due to the fact that your email provider is blocking less secure apps.In this case, you should be able to fix the issue by updating to the latest build of Thunderbird. Thunderbird bug (68.2.0 and older) – If you’re using an older Thunderbird version, you might see this error due to a miscommunication between the Thunderbird application and Mozilla Firefox (only happens if this is set as your main browser).If it works, you just ruled out the possibility of incorrect email credentials. So before doing anything else, attempt to use the same email credentials to connect to the equivalent web client. Incorrect Credentials – One of the most common instances that will prompt this error message to appear is incorrect user credentials. ![]()
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