I've installed s3sync, but when invoking with:

ruby s3sync.rb -r --ssl --delete --verbose --progress /source bucket_name:/destination

s3sync hangs (does not report any errors, nor any progress).  Interestingly enough, if I specify a new destination, it starts copying files to the s3 bucket.

What am I missing here?  All environment variables are present, and accurate.  s3cmd is able to list s3 bucket contents, etc.

Thanks!