Am 24.10.2013 um 09:02 schrieb Tobias Oberstein <tobias.oberst...@tavendo.de>:

>> I just tried to register so I could do that. When I clicked on the register 
>> button
>> after filling out the username/password fields my browser (firefox) brought
>> up a notice that the security certificate is invalid because of unavailable
>> issuance chain information. Knowing absolutely nothing about internet
>> security issues I thought I should mention this and ask if this is expected
>> behavior.
> 
> I wouldn't call that expected behavior, since
> 
> a) the certificate used on twistedmatrix.com contains (as it should) 
> intermediate CA certs also (see attachments)

I’m not sure what you mean with “contains”? It certainly *relies* on one but 
unfortunately doesn’t send it along (yet):

$ openssl s_client -host www.twistedmatrix.com -port 443                        
                                                                                
                                                                                
                                                                                
                                     
CONNECTED(00000003)
depth=0 
/description=S7lbCt7N2R4t9o8J/C=US/CN=www.twistedmatrix.com/emailAddress=postmas...@twistedmatrix.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 
/description=S7lbCt7N2R4t9o8J/C=US/CN=www.twistedmatrix.com/emailAddress=postmas...@twistedmatrix.com
verify error:num=27:certificate not trusted
verify return:1
depth=0 
/description=S7lbCt7N2R4t9o8J/C=US/CN=www.twistedmatrix.com/emailAddress=postmas...@twistedmatrix.com
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
 0 
s:/description=S7lbCt7N2R4t9o8J/C=US/CN=www.twistedmatrix.com/emailAddress=postmas...@twistedmatrix.com
   i:/C=IL/O=StartCom Ltd./OU=Secure Digital Certificate Signing/CN=StartCom 
Class 1 Primary Intermediate Server CA
---

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