Potential DNS Rebind attack detected, see http://en.wikipedia.org/wiki/DNS_rebinding Try accessing the router by IP address instead of by hostname.

[koy]

Hi Professionals,

I have a website hosting on my personal server, I access it outside my network even before.

My problem is, when I installed Pfsense and use a Static IP address but my website can't reach on my new installed pfsense.
this is the error message "Potential DNS Rebind attack detected, see http://en.wikipedia.org/wiki/DNS_rebinding
Try accessing the router by IP address instead of by hostname.".

I still access my website in other network only in my pfsense has a problem.

Can someone encountered this before?

Thank you

[rcoleman-netgate]

@koy said in Potential DNS Rebind attack detected, see http://en.wikipedia.org/wiki/DNS_rebinding Try accessing the router by IP address instead of by hostname.:

Can someone encountered this before?

Hundreds of times.

You are using the same port (443?) for both pfSense and the behind-the-router webserver?

[SteveITS]

@koy https://docs.netgate.com/pfsense/en/latest/config/advanced-admin.html#dns-rebind-check

Sounds like you are allowing access to your WAN IP (pfSense) instead of NAT forwarding port 443 to your web server.

[koy]

@rcoleman-netgate Hi, Thanks for your response.

Yes I used 443 but the other is in Fortinet firewall. The static IP I connect to my pfsense was originally on fortigate, bacause I have a dual wan on my fortigate and I pulled out the 1 isp and connect it to my newly installed Pfsense.

Can you help me to fix this problem.

Thank you

[koy]

@rcoleman-netgate hi, Thank you for your response.

Yes I Allowed access to my WAN IP's but not in Pfsense.

I have fortigate firewall and have a dual WAN (2 ISP). And I allowed both 443 (for redundancy) Access for my web server.

So I created a newly Pfsense and I pulled out 1 ISP to connect to my Pfsense. And after that the problem came. I have a basic configuration in my pfsense, I dont have any port forwarding and NAT config yet.

Can you help me how fix my problem.

Thank you

[SteveITS]

@koy Are you trying to connect to your WAN IP port 443 from LAN? If so you need to enable Reflection on the NAT rule. Otherwise you'll connect to the pfSense web server, and see that message. Or use Split DNS instead.

https://docs.netgate.com/pfsense/en/latest/nat/reflection.html