We have seen this before; there seems to be a bug in the Admin Console.
Originally Posted by floor
You can ssh into the Zimbra server and get the CSR manually either via rsync or by just cat'ing the file to the terminal screen.
The csr file should be located at
So, from the terminal screen you could run:
Copy and paste the output into the GoDaddy screen and you should be all set.
malbec:/opt/zimbra/ssl/zimbra/commercial # cat commercial.csr
-----BEGIN CERTIFICATE REQUEST-----
-----END CERTIFICATE REQUEST-----
Hope that helps,