A Wildcard SSL Certificates helps in achieving SSL encryption on multiple sub-domains with the help of a single certificate as long as the sub domains are on one same physical server, share the same second-level domain name and are under the control of a single organization.
For example, one wildcard certificate *.yourdomain.com would be able to secure the following websites :
However, the following will not work:
These sites would require a separate certificate for each sub-domain:
Older Browsers#'Older' browsers don't recognize wildcard certificates and report a name conflict between the domain and the certificate.
- IE5.5 is ok,
- and I think IE5.0sp2 is ok.
- Prior versions of IE will have problems and I'm not sure
- Netscape - 7 onwards is definitely ok, and I think 6 is as well.
- Not sure about 4.7.