Unison file synchronization only works single threaded transfer

[bturrie]

Im using Unison to synchronize a large sub-directory of /home with a shared folder on a networked file server. It had been running fine with 20 transfer threads until recently but something has changed in the last week or so. Now it only works if I run the transfer with a single thread.

My desktop is running Kubuntu 9.10 the server is running Debian Lenny. My Debian server also runs an apt-mirror for Ubuntu and Debian, as well as my DNS.

Both systems are using Unison 2.27.57. I don't see anything in either system's syslog related to the problem; all I see in the Unison log is the "Lost Connection".

I'm not seeing any issues with my DNS or my mirror and I can copy between systems using samba just fine. Therefore, I don't think I'm having a network problem.

I have two configuration files for the transfer. the first is called common it contains

root = /home/user/Documents/
root = ssh://user@serverip//home/shared/Documents/
maxthreads = 1
ignore = Name *~
ignore = Name *.tmp
ignore = Name .*~
batch = true
log = true

The second file is called corsair.prf. It contains

# Unison preferences file
path = corsair
path = corsair
include common
perms=0

Any suggestions on how to troubleshoot this?