Here is the command I am running and error I get

imapsync --buffersize 8192000 --nosyncacls --subscribe --syncinternaldates --host1 1xx.xx.xxx.xx --user1 newbheckman@fstrf.org --password1 tomtom --host2 1xx.xxx.xx.xxx --user2 bheckman@fstrf.org --password2 tomtom --noauthmd5 --folderrec Closed*
$RCSfile: imapsync,v $ $Revision: 1.310 $ $Date: 2010/02/26 01:24:59 $
Here is a [linux] system (Linux sync.fstrf.org 2.6.18-371.6.1.el5 #1 SMP Wed Mar 12 20:03:51 EDT 2014 x86_64)
with perl 5.8.8
Mail::IMAPClient 2.2.9 and the module Mail::IMAPClient version used here is 2.2.9
Command line used:
/usr/bin/imapsync --buffersize 8192000 --nosyncacls --subscribe --syncinternaldates --host1 192.68.108.30 --user1 newbheckman@fstrf.org --password1 MASKED --host2 192.68.108.30 --user2 bheckman@fstrf.org --password2 MASKED --noauthmd5 --folderrec Closed*
Temp directory is /tmp
Turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1.
TimeZone:[EDT]
Will try to use LOGIN authentication on host1
Will try to use LOGIN authentication on host2
Host1 imap server [1xx.xxx.xx.xxx] port [143] user [newbheckman@fstrf.org]
Host2 imap server [1xx.xxx.xx.xxx] port [143] user [bheckman@fstrf.org]
Banner: * OK cs.fstrf.org Zimbra IMAP4rev1 server ready
Host 1xx.xxx.xx.xxx says it has NO CAPABILITY for AUTHENTICATE LOGIN
Success login on [1xx.xxx.xx.xxx] with user [newbheckman@fstrf.org] auth [LOGIN]
Banner: * OK cs.fstrf.org Zimbra IMAP4rev1 server ready
Host 1xx.xxx.xx.xxx says it has NO CAPABILITY for AUTHENTICATE LOGIN
Success login on [1xx.xxx.xx.xxx] with user [bheckman@fstrf.org] auth [LOGIN]
host1: state Authenticated
host2: state Authenticated
NAMESPACE request failed for 1xx.xxx.xx.xxx: Error sending '8540 LIST "" ""' to IMAP: