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85 lines
2.9 KiB
Plaintext
85 lines
2.9 KiB
Plaintext
#!/bin/cat
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$Id: FAQ.SSL_errors.txt,v 1.6 2018/05/24 11:34:30 gilles Exp gilles $
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This document 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.SSL_errors.txt
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=======================================================================
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Imapsync SSL errors
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=======================================================================
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Questions answered in this FAQ are:
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Q. What are the errors
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DEBUG: .../IO/Socket/SSL.pm:1165: local error: SSL write error
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or
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DEBUG: .../IO/Socket/SSL.pm:1088: local error: SSL read error
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Q. What can I do to avoid those "SSL read/write errors"?
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Q. SSL connect attempt failed SSL
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routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
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=======================================================================
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Q. What are the errors
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DEBUG: .../IO/Socket/SSL.pm:1165: local error: SSL write error
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or
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DEBUG: .../IO/Socket/SSL.pm:1088: local error: SSL read error
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R1.Like they claim, those errors are SSL errors. SSL is not directly
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done by imapsync but by an underlying Perl module called
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IO::Socket::SSL. Those errors arise sometimes and sometimes
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they form a serie that ends with imapsync auto-abortion.
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Those errors happen with some hosts but not with others,
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it's often Exchange or Office365. I don't know what exactly happens.
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Those errors happen more often on Windows than on Linux.
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=======================================================================
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Q. What can I do to avoid those "SSL read/write errors"?
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R0. Windows users: upgrade to imapsync.exe release 1.836 (or next ones)
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Those errors don't appear with recent releases, post 1.836
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R1. Remove all ssl/tls encryption
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imapsync ... --nossl1 --notls1 --nossl2 --notls2
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R2. If you don't want to quit encryption, rerun imapsync until the
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complete sync is over. Those errors are not at the same place
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each time, so imapsync will sync remaining messages at each run
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until none remains.
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R3. Run imapsync on a Linux machine, a VM is ok, there are less
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SSL errors on Unix.
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R4. Use https://imapsync.lamiral.info/X/
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It's a Linux host so response R3 applies there.
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R5. Set up a ssltunnel proxy to the host.
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Read the file FAQ.Security.txt for an example to set up
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a ssltunnel proxy.
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=======================================================================
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Q. SSL connect attempt failed SSL
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routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
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R. Use:
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imapsync ... --sslargs1 'SSL_cipher_list=DEFAULT'
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or
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imapsync ... --sslargs2 'SSL_cipher_list=DEFAULT'
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depending on where the error occurs, host1 or host2 or both.
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=======================================================================
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=======================================================================
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