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I am having this problem now too, see log file: 

== Info: Trying 206.12.27.10:22...
== Info: TCP_NODELAY set
== Info: Connected to grex.westgrid.ca (206.12.27.10) port 22 (#0)
== Info: Failure establishing ssh session: -43, Failed getting banner
== Info: Closing connection 0
== Info: Hostname grex.westgrid.ca was found in DNS cache
== Info: Trying 206.12.27.10:22...
== Info: TCP_NODELAY set
== Info: Connected to grex.westgrid.ca (206.12.27.10) port 22 (#1)
== Info: Failure establishing ssh session: -43, Failed getting banner
== Info: Closing connection 1


Is this still an ongoing problem?