ngircd / xchat SSL issues

I'm trying to setup a ngircd IRC server on Fedora 18 (which was installed using yum), but I'm having some SSL issues. I can connect to the server locally and remotely if I choose to "accept invalid SSL certificates", but get an error otherwise. Here is the XChat output when I try to connect to the IRC server locally: * Connecting to {domain_name} ({ip_address}) port 6697... * * Subject: /OU=Domain Control Validated/OU=PositiveSSL/CN={domain_name} * * Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2 * * Subject: /OU=Domain Control Validated/OU=PositiveSSL/CN={domain_name} * * Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2 * * Subject: /OU=Domain Control Validated/OU=PositiveSSL/CN={domain_name} * * Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=PositiveSSL CA 2 * * Certification info: * Subject: * OU=Domain Control Validated * OU=PositiveSSL * CN={domain_name} * Issuer: * C=GB * ST=Greater Manchester * L=Salford * O=COMODO CA Limited * CN=PositiveSSL CA 2 * Public key algorithm: rsaEncryption (2048 bits) * Sign algorithm sha1WithRSAEncryption * Valid since Nov 7 00:00:00 2012 GMT to Nov 7 23:59:59 2015 GMT * * Cipher info: * Version: TLSv1/SSLv3, cipher DHE-RSA-AES256-SHA (256 bits) * Connection failed. Error: unable to verify the first certificate.? (21) Here is the SSL portion of my ngircd.conf file. I ran ngircd --configtest to test the config file, but it just printed the contents of the file to my terminal. [SSL] CertFile = /etc/pki/tls/certs/{domain_name}.crt DHFile = /etc/pki/tls/private/dhparams.pem KeyFile = /etc/pki/tls/private/{domain_name}.pem KeyFilePassword = {key_file_password} Ports = 6697 I've also tried to connect to the server remotely from a Windows 7 x64 machine using mIRC, but had issues there also. I can't confirm it, but I think Fedora compiles ngircd with GnuTLS and I think my keys were created with OpenSSL. If this were so, would the keys be in a different format? How could I check and convert them? Is it possible that this is a CA trust issue on both of my machines? If so, how/where can I add the CA root certificates in Fedora 18 and Windows 7 so I don't have this problem? Are there any other possible causes? Is there's any other information that I should be providing?