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95 lines
4.2 KiB
Plaintext
95 lines
4.2 KiB
Plaintext
#!/bin/cat
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$Id: FAQ.Authentication_failure.txt,v 1.9 2019/01/11 13:13:08 gilles Exp gilles $
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This documentation is also available online at
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https://imapsync.lamiral.info/FAQ.d/
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https://imapsync.lamiral.info/FAQ.d/FAQ.Admin_Authentication.txt
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=======================================================================
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Imapsync authentication issues
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=======================================================================
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Questions answered in this FAQ are:
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Q. Imapsync fails with the following error, what can I do?
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Host1 failure: Error login on [imap.example.com] with user [foo] auth [LOGIN]: 2 NO [AUTHENTICATIONFAILED] Authentication failed
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Q. Imapsync fails with the following error, what can I do?
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Host2 failure: Error login on [imap.example.com] with user [foo] auth [LOGIN]: 2 BAD Invalid characters in atom
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=======================================================================
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Q. Imapsync fails with the following error, what can I do?
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Host1 failure: Error login on [imap.example.com] with user [foo] auth [LOGIN]: 2 NO [AUTHENTICATIONFAILED] Authentication failed
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R. One over four imapsync syncs ends up quickly with the error message
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"Authentication failed" or "NO LOGIN failed" or similar.
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Authentication failure is the primary failure with imapsync
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and since nothing tangible can be done without authentication,
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this stage must succeed to go further.
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Here are some advices to get you pass this difficult stage of authentication:
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* Triple check each credential parameter, there are three parameters at each side:
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* triple check --host1
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* triple check --user1
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* triple check --password1
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* triple check --host2
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* triple check --user2
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* triple check --password2
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* If you can authenticate successfully with an other imap client software
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like Thunderbird or Outlook or Sparrow then it is a very good sign to
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authenticate successfully with imapsync. Examine the parameters of
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this other imap client and copy them as is for imapsync.
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* Use option --showpasswords
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At the beginning of the output, imapsync dumps all its command
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line parameters; it's the line after "Command line used:".
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With --showpasswords, imapsync prints the passwords received
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instead of the string MASKED. It helps for debugging quoting issues.
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Option --showpasswords shows passwords again when the IMAP dialog
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is dumped by --debugimap option. Search for a line like
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"Sending: 2 LOGIN test1 secret1" (secret1 is the password here)
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* It is sometimes very hard to quote correctly unusual characters,
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especially on Windows. See
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https://imapsync.lamiral.info/FAQ.d/FAQ.Passwords_on_Windows.txt
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https://imapsync.lamiral.info/FAQ.d/FAQ.Passwords_on_Unix.txt
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The quickest trick may be to change the password temporally
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with easy characters like the classical alphabet, a long
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string still ensure strong security.
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* Sometimes some servers announce they support LOGIN but it
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actually fails because the authentication mechanism
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working is something else like CRAM-MD5 or PLAIN.
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So:
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* Try --authmech1 CRAM-MD5 (or --authmech2 CRAM-MD5)
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* Try --authmech1 PLAIN (or --authmech2 PLAIN)
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* If you want to play manually the IMAP protocol on your server,
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here is an example with the command telnet, user test1
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and password secret1 on the host test.lamiral.info.
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telnet test.lamiral.info 143
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c1 LOGIN test1 "secret1"
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c2 LOGOUT
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Same example using an ssl conneection:
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telnet-ssl -z ssl test.lamiral.info 993
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c1 LOGIN test1 "secret1"
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c2 LOGOUT
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=======================================================================
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Q. Imapsync fails with the following error, what can I do?
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Host2 failure: Error login on [imap.example.com] with user [foo] auth [LOGIN]: 2 BAD Invalid characters in atom
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R. It might be a Dovecot imap server. The password string might
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contain special characters that Dovecot doesn't like. Change them.
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=======================================================================
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=======================================================================
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