HI 
1. i  have  2 asp.net appllications & 1 sharepoint web applications created on PORT 443.
2. we have two SSL certificates installed in IIS
1 step:// i created a sharepoint web app on port 443  with hostname : www.xyz1.com and i assigned a Cerficate for example : www.xyz1.com 
2. step i created a asp.net application on port 443 with hostname : beta.xyz1.com and when i try to assign a diffrent certificate for ex: beta.xyz1.com
i got the below warning
At least one other site is using the same HTTPS binding and the binding is configured with a different certificate. Are you sure that you want to reuse this HTTPS binding and reassign the other site or sites to use the new certificate?
when i do IIS binding with second application i got the following warning message in IIS 8.5 which ...

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