[GH-ISSUE #347] IPv6 connection refused / IPv6 Support #288

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opened 2026-02-26 00:36:45 +03:00 by kerem · 0 comments

kerem commented

2026-02-26 00:36:45 +03:00

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Originally created by @Lky on GitHub (Jul 16, 2013).
Original GitHub issue: https://github.com/jberkel/sms-backup-plus/issues/347

I got an error on an IPv6 setup, client + server.

The imap server is dovecot with ipv4/ipv6
Android 4.1.1 / Oppo Find 5 Stock Firmware / SiXxS IPv6 tunnel
Tests:
- server ipv4 - client ipv4/6 = works
- server ipv6 - client ipv4/6 = fails
- server ipv4/6 - client ipv4/6 = fails
- server ipv6 - client ipv6 = fails
- server ipv4 - client ipv4 = works
- server ipv4/6 - client ipv6 = fails
- server ipv4/6 - client ipv4 = works

Current version of K9 Mail works with this server without problems (IPv4 and IPv6)

german 1st try

16-07 15:59 Using config:
BackupConfig{imap=BackupImapStore{uri=imap+tls+://user@domain.tld:XXXXXXXXXXXXXXXXXXXX@mail.domain.tld:143}, skip=false, currentTry=0, maxItemsPerSync=-1, groupToBackup=ContactGroup{_id=-1, type=EVERYBODY}, backupType=MANUAL, debug=true, typesToBackup=[SMS, MMS, CALLLOG, WHATSAPP]}
16-07 15:59 Allgemeiner Fehler: Unable to connect (exception: com.fsck.k9.mail.MessagingException: Unable to connect, underlying=java.net.ConnectException: failed to connect to mail.domain.tld/2222:43f:130:b00b::c0c5 (port 143) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused))

english 2nd try

16-07 17:18 Backup requested (manual)
16-07 17:18 Starting backup (MANUAL)
16-07 17:18 Backing up (0 SMS, 0 MMS, 1 call log)
16-07 17:18 General error: Unable to connect (exception: com.fsck.k9.mail.MessagingException: Unable to connect, underlying=java.net.ConnectException: failed to connect to mail.domain.tld/2a01:3f3:325:b00b::c0c5 (port 143) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused))
16-07 17:18 Backup finished

Originally created by @Lky on GitHub (Jul 16, 2013). Original GitHub issue: https://github.com/jberkel/sms-backup-plus/issues/347 I got an error on an IPv6 setup, client + server. - The imap server is dovecot with ipv4/ipv6 - Android 4.1.1 / Oppo Find 5 Stock Firmware / SiXxS IPv6 tunnel - Tests: - server ipv4 - client ipv4/6 = works - server ipv6 - client ipv4/6 = fails - server ipv4/6 - client ipv4/6 = fails - server ipv6 - client ipv6 = fails - server ipv4 - client ipv4 = works - server ipv4/6 - client ipv6 = fails - server ipv4/6 - client ipv4 = works **Current version of K9 Mail works with this server without problems (IPv4 and IPv6)** ## german 1st try 16-07 15:59 Using config: BackupConfig{imap=BackupImapStore{uri=imap+tls+://user@domain.tld:XXXXXXXXXXXXXXXXXXXX@mail.domain.tld:143}, skip=false, currentTry=0, maxItemsPerSync=-1, groupToBackup=ContactGroup{_id=-1, type=EVERYBODY}, backupType=MANUAL, debug=true, typesToBackup=[SMS, MMS, CALLLOG, WHATSAPP]} 16-07 15:59 Allgemeiner Fehler: Unable to connect (exception: com.fsck.k9.mail.MessagingException: Unable to connect, underlying=java.net.ConnectException: failed to connect to mail.domain.tld/2222:43f:130:b00b::c0c5 (port 143) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused)) ## english 2nd try 16-07 17:18 Backup requested (manual) 16-07 17:18 Starting backup (MANUAL) 16-07 17:18 Backing up (0 SMS, 0 MMS, 1 call log) 16-07 17:18 General error: Unable to connect (exception: com.fsck.k9.mail.MessagingException: Unable to connect, underlying=java.net.ConnectException: failed to connect to mail.domain.tld/2a01:3f3:325:b00b::c0c5 (port 143) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused)) 16-07 17:18 Backup finished