Update ssh_putty.md

doc.zih.tu-dresden.de/docs/access/ssh_putty.md

@@ -4,6 +4,13 @@ PuTTY is a free and open-source terminal emulator, serial console and network fi
 application, supports several network protocols, including SCP, SSH. Visit the
 [homepage](https://www.putty.org) for more information.
 
+??? info "VPN connection"
+
+    The ZIH
+     [FAQ and service catalog page](https://tu-dresden.de/zih/dienste/service-katalog/ arbeitsumgebung/zugang_datennetz/vpn) 
+    provides information about how to set up the VPN connection
+     and solutions for most common issues.
+
 ## Download and install
 
 Download the installer suiting best your current system and run it afterwards. Follow the