Pfsense 2.4.3 support san cert?
Pfsense 2.4.3 support san certificate?
In what way? Your question is a bit too vague. Can you be more specific about what you're wanting to do with the certificate?
pfSense 2.4.3 can create certificates with SANs, and they work fine for things like the GUI. I'm not aware of any problems in any area of pfSense with using SANs.