There is a suggested work around for this problem described here: http://sachinsudheendra.github.io/2014/03/08/using-go-cd-with-custom-certificates.html
Haven't tried it yet but will be doing so soon so will post results here when I have tried it.
Edit: I tried this today and can confirm it works fine.
Tested using OpenSSL 64-bit http://slproweb.com/download/Win64OpenSSL-1_0_0l.exe
Steps to reproduce (on Windows Server 2012 R2 using GO version 13.4):
(Assumes you have already created a DNS entry for the name you wish to use e.g. mycdserver.mycompany.com)
(These steps can be performed on any machine with OpenSSL installed)
Export the key file from the .pfx source file using the following command:
openssl pkcs12 -in mycertificatepath.pfx -nocerts -out mycertificatepath.key
Export the crt file from the .pfx source file using the following command:
openssl.exe pkcs12 -in mycertificatepath.pfx -clcerts -nokeys -out mycertificatepath.crt
Convert the key file and crt file into a pkcs12 file using the following command:
openssl pkcs12 -inkey mycertificatepath.key -in mycertificatepath.crt -export -out mycertificatepath.pkcs12
(These steps should be performed on the server)
Import the PKCS12 file produced in the earlier steps into a keystore file using the KeyTool executable in the bin directory using the following command:
keytool -importkeystore -srckeystore mycertificatepath.pkcs12 -srcstoretype PKCS12 -destkeystore keystore -srcalias 1 -destalias cruise
Stop the Go Server service using the following command:
net stop "Go Server"
Start the Go Server service using the following command:
net start "Go Server"
Verify that the service has started correctly and try to navigate to the url corresponding to your certificate over https e.g. mycdserver.mycompany.com
You may need to close your browser first however once reopened you should see your GO server over HTTPS with valid certificate (assuming your client is setup to trust the certificate authority that issued the certificate!)
If there are any problems then the GO Server service will stop and details will be logged in the file "C:\Program Files (x86)\Go Server\go-server-wrapper.log"
Hope that helps.