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hc_andy_35682's avatar
hc_andy_35682
Icon for Nimbostratus rankNimbostratus
Mar 07, 2012

Subject Alternative Name (SAN) Certificates

Hi All,

 

 

We're about to install a SAN certificate for a series of FQDN's on the F5.

 

 

I've followed F5's guide on how to generate the CSR for SAN certificates but not sure what happens when I need to add a new FQDN to the existing SAN certificate further down the track???

 

 

https://support.f5.com/kb/en-us/solutions/public/11000/400/sol11438.html

 

 

Example:

 

 

CSR generated with following FQDN's:

 

- https://abc.com

 

- https://123.abc.com

 

- https://456.abc.com

 

 

Several months later the client has a requirement to also add in another FQDN https://789.abc.com.

 

 

Do I have to re-generate the CSR again and get a new SAN certificate from the CA vendor to cover all four FQDN's now???

 

 

Thanks.

 

 

Andy

 

 

 

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Mar 07, 2012
    Hi Andy,

     

     

    Yes, if the SAN list needs to change you need to generate a new CSR and get a new certificate. You could reuse the same private key or generate a new one with the new CSR.

     

     

    Aaron