diff --git a/FAQ.md b/FAQ.md
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--- a/FAQ.md
+++ b/FAQ.md
@@ -88,6 +88,7 @@ https://github.com/elico/rustdesk-ansible-installer
 
 - Most users can make it work following the tutorial: https://rustdesk.com/docs/en/self-host/rustdesk-server-oss/install/ and here is another good tutorial https://www.linkedin.com/pulse/building-your-own-remote-desktop-solution-rustdesk-cloud-montinaro-bv94f
 - Ensure there is only one `hbbs` process running on your server
+- [Key mismatch](https://www.reddit.com/r/rustdesk/search/?q=key+mismatch&cId=d555648b-dbf7-46dd-8fc8-dddb86ec9a07&iId=f47eef58-bcf0-4557-9687-ae79bb16eb4a)
 - These videos should be helpful. https://www.youtube.com/watch?v=9nzHm3xGz2I and https://www.youtube.com/watch?v=EeFqj23jxMk. This one is also good, https://www.youtube.com/watch?v=OPVFVAnmpLk. Another one in French: https://www.youtube.com/watch?v=J7t32K5--cM
 - This video for Windows, https://discord.com/channels/804630702657110016/804630702657110018/1254653367037329499, but it does not cover https and firewall etc.
 - Most questions are about Linux and network, which can be Googled and ChatGPTed.