bzr cannot check it, when attempting to it crashs

Connected (version 2.0, client OpenSSH_5.3)
bzr: ERROR: bzrlib.errors.TooManyConcurrentRequests: The medium 'SmartSSHClientM
edium(/)' has reached its concurrent request limit
. Be sure to finish_writing and finish_reading on the currently open request.

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 920, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1131, in run_bzr
  File "bzrlib\commands.pyo", line 673, in run_argv_aliases
  File "bzrlib\commands.pyo", line 695, in run
  File "bzrlib\cleanup.pyo", line 136, in run_simple
  File "bzrlib\cleanup.pyo", line 166, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 3678, in run
  File "bzrlib\decorators.pyo", line 218, in write_locked
  File "bzrlib\workingtree_4.pyo", line 213, in commit
  File "bzrlib\decorators.pyo", line 218, in write_locked
  File "bzrlib\mutabletree.pyo", line 211, in commit
  File "bzrlib\commit.pyo", line 290, in commit
  File "bzrlib\cleanup.pyo", line 132, in run
  File "bzrlib\cleanup.pyo", line 166, in _do_with_cleanups
  File "bzrlib\commit.pyo", line 364, in _commit
  File "bzrlib\commit.pyo", line 542, in _check_bound_branch
  File "bzrlib\decorators.pyo", line 155, in read_locked
  File "bzrlib\branch.pyo", line 2674, in get_master_branch
  File "bzrlib\branch.pyo", line 2683, in _get_master_branch
  File "bzrlib\branch.pyo", line 185, in open
  File "bzrlib\controldir.pyo", line 687, in open
  File "bzrlib\controldir.pyo", line 721, in open_from_transport
  File "bzrlib\bzrdir.pyo", line 1499, in open
  File "bzrlib\remote.pyo", line 317, in _open
  File "bzrlib\remote.pyo", line 436, in __init__
  File "bzrlib\remote.pyo", line 448, in _probe_bzrdir
  File "bzrlib\remote.pyo", line 455, in _rpc_open_2_1
  File "bzrlib\remote.pyo", line 73, in _call
  File "bzrlib\smart\client.pyo", line 59, in call
  File "bzrlib\smart\client.pyo", line 72, in call_expecting_body
  File "bzrlib\smart\client.pyo", line 55, in _call_and_read_response
  File "bzrlib\smart\client.pyo", line 155, in call_and_read_response
  File "bzrlib\smart\client.pyo", line 218, in _call_determining_protocol_versio
n
  File "bzrlib\smart\client.pyo", line 189, in _call
  File "bzrlib\smart\client.pyo", line 265, in _send
  File "bzrlib\smart\client.pyo", line 241, in _construct_protocol
  File "bzrlib\smart\medium.pyo", line 884, in get_request
  File "bzrlib\smart\medium.pyo", line 1167, in __init__
TooManyConcurrentRequests: The medium 'SmartSSHClientMedium(/)' has reached its concurrent request limit. Be sure to finish_writin
g and finish_reading on the currently open request.

bzr 2.5.1 on python 2.6.6 (Windows-7-6.1.7601-SP1)
arguments: ['bzr', 'ci']
plugins: bzrtools[2.5.0], changelog_merge[2.5.1], colo[0.4.0],
    explorer[1.2.2], fastimport[0.14.0dev], git[0.6.8], launchpad[2.5.1],
    loom[2.3.0dev], netrc_credential_store[2.5.1], news_merge[2.5.1],
    pipeline[1.4.0], qbzr[0.22.3], rewrite[0.6.4dev], svn[1.2.2],
    upload[1.2.0dev], xmloutput[0.8.8]
encoding: 'cp1252', fsenc: 'mbcs', lang: None

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.