Forgot to add, when I try to get new messages, all I see is a message at the bottom that says "Connected to pop.cox.net...." that just stays there until I do something else.

Using Norton or some other anti virus scanner that thinks it can scan mail but really cannot? All jokes aside, you are probably running into issues with security software. ANti virus springs to mind because most can not cope with SSL/TLS encrypted connections and total failure is often the result of them not doing what it says on the box. Try turning off any email scanning.

Thanks for your response. I have ESET NOD32 antivirus installed. I turned off its Web access protection, email client protection, and anti-phishing protection, restarted Thunderbird, but there was no difference, I still can't get email in the changed accounts. I also have SuperAntiSpyware installed, but I can't see anything in its settings that deal with email and I don't think it scans incoming email.

When you modify server settings, it sometimes helps to reset the password: Tools/Options/Security/Passwords/Saved Passwords, Show passwords, select the entries for the Cox account, Remove, OK to close Options, restart TB, enter the correct password when prompted, check the box to save it in Options.

Thanks for the suggestion. I showed the passwords for my accounts, and removed the password for one of the accounts having problems, as you suggested. I then closed and restarted TB, but it does not prompt me for a password when I ask it to get messages. Seems like there's a problem there.

According to a Cox forum, the server settings should be pop.cox.net on port 995, SSL/TLS, normal password, which you already have (imap.cox.net on port 993 for IMAP). But the User name should be your email address without the "@cox.net". Is that what you have? If you have the full address, that could explain the error.

Yes, that is indeed what I have, the username is without the @cox.net.

Just to rule out the interference of ESET or any other program with email, start in Windows safe mode and see if it makes any difference. Instructions here.

Thanks very much, that was it. After moving my laptop to my office where I had an ethernet cable, I booted up in safe mode. When I started TB it prompted me for passwords for the accounts I had updated, and then retrieved all my emails. This is obviously not a fix for the problem, but at least I can now take it up with ESET. Thanks again.

After disabling "POP3S Checking" in the ESET advanced settings for Email Protocols, I can now get my emails. Thanks to all who responded!

Where do I find the ESET settings? Can you walk me through it?

Click on Settings from the ESET home window. From there, click on the right arrow on the far right hand side next to Internet Protection. Then click on the gear icon to the right of "Email client protection". You should now be looking at a window that says "Advanced Setup". Scroll down on the right until you see "Email Protocols". Expand that, and in its list you'll see POP3S Scanner Setup, and beneath that "Enable POP3S checking". Click to disable that. That's what fixed it for me.

Sorry, ESET home window? Thank you for your reply.

jgautreau said

Sorry, ESET home window? Thank you for your reply.

Do you have ESET NOD32 antivirus installed on your system? If not, which AV do you have?

Oh, I use AVG

jgautreau said

Oh, I use AVG

Please continue in your original thread:

https://support.mozilla.org/en-US/questions/1199285

Run in Windows safe mode as explained above and see if you still have problems.

Turning off my AVG worked but I don't want to leave it that way

I am locking this thread to prevent further off topic posts.

@jgautreau I suggest you continue on your own thread as sfhowes suggested.