diff --git a/infrastructure-guide/initial_setup.md b/infrastructure-guide/initial_setup.md
index b4e94c50..8bacf7db 100644
--- a/infrastructure-guide/initial_setup.md
+++ b/infrastructure-guide/initial_setup.md
@@ -36,6 +36,10 @@ The steps involved to bootstrap the boot server and the repository server are th
 
     1. Start the VM to trigger the install
 
+```{note}
+For the initial setup of boot and repos server in the DMZ a temporary firewall access rule need to be enabled to the PSI internal server https://repos.psi.ch 
+```
+
 ## References
 - https://weldr.io/lorax/mkksiso.html
 - https://access.redhat.com/solutions/60959