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Description of problem: Attempting to logout while bz was in maint mode software errors with: bz xmlrpc call failed: no call object returned on User.login at Hwcert.pm line 206. This should not exit with a software error but a more intentional message as to not alarm the user. A similar message appears when logging in; again it's not that a login was possible but that it should not software error but go to an error handler code path.
Created attachment 566781 [details] new patch for Hwcert.pm if xmlrpc service unavailable when logging in, clear the browser's cookies those are Bugzilla_cookie and Bugzilla_login, if not, after service is back when calling xmlrpc logout, there will be an error 'login required', and will cause confuse.
ok, patch looks good
verified on web2