Thunderbird may sometimes throw an error that says the connection to the server was reset.
This oops message can take users by surprise.
Usually, it occurs all of a sudden without any tell-tale signs.
If youre looking for a solution to fix this problem, youve got a series of potential solutions below.
It seems the error is triggered by a conflict between the two programs.
Disabling theAVG Email Shieldsolved this problem for many users.
Go toBasic Protectionand disable theEmail Shield.
However, you gotta turn off the Email Shielf every time you power up your machine.
Apparently, the error re-appears after every shutdown.
So, this is only a temporary workaround.
But its a handy one nevertheless.
Reinstall AVG
Reinstall AVG and test whether this solves the problem.
Maybe some AVG files got corrupted.
look to see if the server connection still gets reset with a fresh copy of AVG installed.
If the antivirus youre using has a built-in email shield similar to AVGs, go ahead and disable it.
you might also whitelist Thunderbird in your antivirus prefs.
The steps to follow are different for each antivirus tool.
For detailed instructions, go to your antivirus official support page.
you could either disable IPv6 or accept only IPv4 domains.
The data pipe.dns.isableIPv6 setting is simpler to use than setting the domain to Gmail.
So, if you want a simpler solution, edit the IPv6 setting.
Then close Thunderbird and launch it again.
find out if this method ironed out the error.
Disable Your VPN
If youre using a VPN program, go ahead and disable it.
Many users solved this problem by simply turning off their VPN.
It seems that VPN tools, and NordVPN particularly, often interfere with Thunderbird.
If nothing worked, you may want to temporarily switch to a different email service.
Maybe Thunderbird is affected by a server problem that Mozilla has yet to acknowledge.
verify if other users complained about the same problem recently.
Let us know if your connection to the email server is stable now.
Do tell us which solution worked for you!
