The failure is in test_agent test_setsTrustRootOnContextDefaultTrustRoot This fails if wincertstore is available with this failure:- twisted.trial.unittest.FailTest: <twisted.internet._sslverify.OpenSSLWindowsCertificateAuthorities object at 0x037DB2B0> is not an instance of <class 'twisted.internet._sslverify.OpenSSLDefaultPaths'> This is because the patch from aaron which I have applied has_sslverify.platformTrust check for wincertstore and does not return OpenSSLDefaultPaths but returns _sslverify.OpenSSLWindowsCertificateAuthorities The solution I followed was to add a test to specifically check for a return of OpenSSLWindowscertificateAuthorities if wincertstore was available otherwise to skip it. The other part was to skip the test for test_setsTrustRootOnContextDefaultTrustRoot if wincertstore was available The error message comes from the tests for the root name servers. I just need to fix that so I have a clean test run before making any changes. I just can't see what the problem is with the error Thanks -- *John Aherne* *www.rocs.co.uk <http://www.rocs.co.uk>* 020 7223 7567