Cisco ise 1.2 install certificates for ise cluster question

hello all i have an ise cluster of 4 devices. 1 primary admin/secondary monitor, 1 secondary admin/primary admin and 2 policy nodes
i need to install public CA certs on them. can I generate 1 CSR on one of the nodes, that includes a SAN with the DNS names of all the nodes?
Therefore get only 1 cert from the CA, and export and import the same cert into all the other nodes?
or do i have to generate 1 CSR for each node and purchase 4 certs? Wild card certs is not an option. tHANKS,

ISE allows you to install a certificate with multiple Subject Alternative Name (SAN) fields. A browser reaching the ISE using any of the listed SAN names will accept the certificate without any error as long as it trusts the CA that signed the certificate.
The CSR for such a certificate cannot be generated from the ISE GUI. http://www.cisco.com/c/en/us/support/docs/security/identity-services-engine-software/113675-ise-binds-multi-names-00.html
Cisco ISE checks for a matching subject name as follows:
1. Cisco ISE looks at the subject alternative name (SAN) extension of the certificate. If the SAN contains one or more DNS names, then one of the DNS names must match the FQDN of the Cisco ISE node. If a wildcard certificate is used, then the wildcard domain name must match the domain in the Cisco ISE node's FQDN.
2. If there are no DNS names in the SAN, or if the SAN is missing entirely, then the Common Name (CN) in the Subject field of the certificate or the wildcard domain in the Subject field of the certificate must match the FQDN of the node.
3. If no match is found, the certificate is rejected.
Regards,
Jatin Katyal
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Hi
The error message means:
This is an indication that the client does not have or does not trust the Cisco ISE certificates.
For both the client/server certs, If there are multiple levels in the cert chain (Intermediate certs) and if so, you need to make sure that intermediate
certs been installed in ISE and in the client machine as well.
- Could you provide me the model and make of the supplicant, you have been facing issue with? Is it Android 4.1.x. Also is it happening with justone client or with all of the clients?
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Minakshi (Do rate the helpful posts )

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