1871164 - Thunderbird 115 breaks support for IDN-mailboxes

Status: RESOLVED DUPLICATE of bug 1870720

(Thunderbird :: Untriaged, defect)

Description

[John]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Steps to reproduce:

After updating from 102 to 115 broke my entire profile, I went digging and found issues with IDN-mailboxes in Thunderbird 115.
This is the error message that I got, while getting a blank screen instead of the mailbox-view:
"Uncaught (in promise) NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgFolder.server]"

Here are the steps that lead me to believe that Thunderbird 115 somehow broke support for IDN-mailboxes:

1. Create a new Thunderbird 115 install/blank profile.
2. Try to create new mailbox by entering details for an IDN-mailbox in Punycode.
   Testing data (not a real address/domain, but it is enough to trigger the error):
   Name: Thun
   E-Mail-Address: [e-mail]
   Passwort: gibberish
   Manually set server settings:
   IMAP, xn--thnderbird-beb.com, 993, SSL/TLS, Encrypted Password, [e-mail]
   SMTP, xn--thnderbird-beb.com, 465, SSL/TLS, Encrypted Password, [e-mail]
3. Hit done

Actual results:

The mailbox should be added. Verified working in a new Thunderbird 102 install.

Expected results:

Thunderbird throws an error:
Component returned failure code: 0x80004005
(NS_ERROR_FAILURE) [nsIMsgIncomingServer.verifyLogon]