Comment 1 for bug 434411

Also, could you run the following steps to generate a new certificate and
then examine it to see what the "Subject" names are?

{{{
% python
>>> from foolscap import Tub
>>> t = Tub(certFile="dummy.pem")
>>> (Control-D)
% ls dummy.pem
dummy.pem
% openssl x509 -in dummy.pem -text
}}}

On my OS-X system, I see "Subject: CN=newpb_thingy". Do you get the same? It
might also help us if you could attach that dummy.pem file to this ticket
(but of course don't use it for anything else).

My current hunch is that the Foolscap-generated x509 certificates are either
being created with corrupt (i.e. non-UTF-8) subject-name strings, or they're
somehow being corrupted afterwards.