> Source: [sk36705](https://support.checkpoint.com/results/sk/sk36705)

# sk36705 - Configure internal certificate for site to site while using external certificate for remote users

| Property | Value |
|----------|-------|
| Solution ID | sk36705 |
| Date Created | 2008-12-25 |
| Last Modified | 2023-12-27 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |

## Symptoms

- Central Gateway's Properties has both the Internal CA and External CA's Certificate in IPSec VPN - Repository of Certificates Available to the Gateway. When trying to initiate an VPN Tunnel from the remote GW, in Main mode Packet 3 both Certificates are seen, but the remote Firewall chooses to use the ExternalCA Certificate, which cannot be validated

## Solution

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