TooManyConcurrentRequests when failing to open ssh connection

Upon attempting commit with Pageant turned off, bzr fails to load the ssh keys needed for communication. This results in a misleading TooManyConcurrentRequests error.

Wed 2010-09-08 17:45:13 -0400
0.052 bazaar version: 2.1.1
0.052 bzr arguments: [u'-Dhpss', u'commit', u'-m', u'Support for user access/control of session.', u'src/core.h', u'src/wpp.cpp']
0.064 looking for plugins in C:/Users/Rafael Rivera/AppData/Roaming/bazaar/2.0/plugins
0.064 looking for plugins in C:/Program Files (x86)/Bazaar/plugins
0.179 encoding stdout as sys.stdout encoding 'cp437'
0.219 opening working tree 'C:/Users/Rafael Rivera/Documents/Visual Studio 2010/Projects/CoApp/coapp-trace'
0.266 hpss: Built a new medium: SmartSSHClientMedium
0.289 bzr-svn: using Subversion 1.6.6 ()
0.398 hpss call: 'BzrDir.open_2.1', '~coapp-trace-developers/coapp-trace/trunk/'
0.398 (to bzr+ssh://bazaar.launchpad.net/~coapp-trace-developers/coapp-trace/trunk/)
0.409 falling back to default implementation
0.409 failed to load system host keys: [Errno 2] No such file or directory: 'C:\\Users\\Rafael Rivera/.ssh/known_hosts'
[ 5936] 2010-09-08 17:45:14.440 INFO: Connected (version 2.0, client Twisted)
1.471 Could not connect to bound branch, falling back to local nick.
 Unable to connect to target of bound branch BzrBranch7('file:///C:/Users/Rafael%20Rivera/Documents/Visual%20Studio%202010/Projects/CoApp/coapp-trace/') => bzr+ssh://bazaar.launchpad.net/~coapp-trace-developers/coapp-trace/trunk/: Connection error: Unable to authenticate to SSH host as
  <email address hidden>
supported auth types: ['publickey']
1.471 preparing to commit
1.495 Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 853, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1055, in run_bzr
  File "bzrlib\commands.pyo", line 661, in run_argv_aliases
  File "bzrlib\commands.pyo", line 665, in run_direct
  File "bzrlib\cleanup.pyo", line 122, in run_simple
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 3138, in run
  File "bzrlib\decorators.pyo", line 194, in write_locked
  File "bzrlib\workingtree_4.pyo", line 197, in commit
  File "bzrlib\decorators.pyo", line 194, in write_locked
  File "bzrlib\mutabletree.pyo", line 225, in commit
  File "bzrlib\commit.pyo", line 257, in commit
  File "bzrlib\cleanup.pyo", line 118, in run
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "bzrlib\commit.pyo", line 332, in _commit
  File "bzrlib\commit.pyo", line 473, in _check_bound_branch
  File "bzrlib\decorators.pyo", line 140, in read_locked
  File "bzrlib\branch.pyo", line 2381, in get_master_branch
  File "bzrlib\branch.pyo", line 169, in open
  File "bzrlib\bzrdir.pyo", line 843, in open
  File "bzrlib\bzrdir.pyo", line 878, in open_from_transport
  File "bzrlib\bzrdir.pyo", line 2088, in open
  File "bzrlib\bzrdir.pyo", line 3327, in _open
  File "bzrlib\remote.pyo", line 115, in __init__
  File "bzrlib\remote.pyo", line 127, in _probe_bzrdir
  File "bzrlib\remote.pyo", line 134, in _rpc_open_2_1
  File "bzrlib\remote.pyo", line 52, in _call
  File "bzrlib\smart\client.pyo", line 132, in call
  File "bzrlib\smart\client.pyo", line 145, in call_expecting_body
  File "bzrlib\smart\client.pyo", line 90, in _call_and_read_response
  File "bzrlib\smart\client.pyo", line 45, in _send_request
  File "bzrlib\smart\client.pyo", line 115, in _construct_protocol
  File "bzrlib\smart\medium.pyo", line 707, in get_request
  File "bzrlib\smart\medium.pyo", line 916, in __init__
TooManyConcurrentRequests: The medium 'SmartSSHClientMedium(bzr+ssh://<email address hidden>/)' has reached its concurrent request limit. Be sure to finish_writing and finish_reading on the currently open request.

1.497 couldn't find apport bug-reporting library: No module named apport
1.505 Traceback (most recent call last):
  File "bzrlib\plugin.pyo", line 471, in _get__version__
  File "bzrlib\__init__.pyo", line 93, in _format_version_tuple
IndexError: tuple index out of range

1.515 Transferred: 0KiB (0.0K/s r:0K w:0K)
1.516 return code 4
[ 5936] 2010-09-08 17:45:15.309 INFO: HPSS calls: 2 (0 vfs) SmartSSHClientMedium(bzr+ssh://<email address hidden>/)
[ 1196] 2010-09-08 17:45:40.711 INFO: Client disconnected from pipe - closing connection
[ 1196] 2010-09-08 17:51:05.289 INFO: Discarding watch for C:\Users\Rafael Rivera\Documents\Visual Studio 2010\Projects\CoApp\coapp-trace - it has expired