Hi There, Does Twisted support or is there any way of loading intermediate CA certs from a chain file? I have a SSL certificate issued by Thawte, but my system administrator says as quoted: Looks like you may need to install an Intermediary certificate. Relevant certs for Thawte can be found at https://search.thawte.com/support/ssl-digital-certificates/index?page=content&actp=CROSSLINK&id=SO13881 I am not sure, how to generate a chain file and later, how to use it in twisted ssl enabled server. At the moment, I am using following line of code: root_ssl_service = internet.SSLServer(443, site_ssl, DefaultOpenSSLContextFactory( privateKeyFileName="cert/server.key", certificateFileName="cert/server.pem")) Thanks in advance. Sury