LDAP Address Book is configured to access Active Directory with a bind login, port 636. Directory works while in Address Book tab: searching for names returns results. No errors in Developers' Error Console. Address search/autocompletion does not work while in message compose window. Directory is selected in Account Settings > Addressing. Error Console shows: mailnews.ldap: error { target: TCPSocket, isTrusted: true, name: "ConnectionRefusedError", message: "Network", errorCode: 2152398861, srcElement: TCPSocket, currentTarget: TCPSocket, eventPhase: 2, bubbles: false, cancelable: false, … } (LDAPClient.sys.mjs:264:18) ​ It also shows 'port: 0', perhaps should use port: 636. target: TCPSocket { host: "xxx.xxx.xxx", port: 0, ssl: true, … } ​ Is this a known issue? Is there a fix/workaround? Thunderbird 142.0 (64-bit) on Debian Sid.