Hi, This looks strongly like TLS session reuse. When a SSL session is successfully reused, OpenSSL provides the client certificate but not the certificate chain. If you are using a proxy, the client certificate is the proxy - and, as this is not an EEC, the DN extraction fails. Oliver: you can probably confirm this by trying to trick GFAL to using your client certificate and not a proxy. So, the question is: why is SSL reuse occurring? Brian -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1276#issuecomment-685702386 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1