Migrate from Kerio to Nethserver

I have create my own user (for testing) on Nethserver.

Now if i want to use imapsync i use the following command in the terminal

imapsync --host1 192.168.1.153 --user1 martin --password1 MASKED --host2 192.168.1.200 --user2 martin --password2 MASKED –ssl2

i get the following output

Temp directory is /tmp
PID file is /tmp/imapsync.pid
Modules version list:
Mail::IMAPClient 3.35
IO::Socket 1.37
IO::Socket::INET 1.35
IO::Socket::SSL 1.997
Digest::MD5 2.53
Digest::HMAC_MD5 1.01
Term::ReadKey 2.32
Authen::NTLM ?

Info: turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1.
Info: will try to use LOGIN authentication on host1
Info: will try to use LOGIN authentication on host2
Host1: imap server [192.168.1.153] port [143] user [martin]
Host2: imap server [192.168.1.200] port [993] user [martin]
Banner: * OK Kerio Connect 7.3.2 IMAP4rev1 server ready
Info: host 192.168.1.153 says it has CAPABILITY for AUTHENTICATE LOGIN
Info: success login on [192.168.1.153] with user [martin] auth [LOGIN]
Failure: can not open imap connection on [192.168.1.200] with user [martin]:

what am i doing wrong ?