Update Kerberos Authentication documentation

Author: carlospolop

src/windows-hardening/active-directory-methodology/kerberos-authentication.md

@@ -2,19 +2,6 @@
 
 {{#include ../../banners/hacktricks-training.md}}
 
-Kerberos is time-sensitive. A typical default clock skew tolerance is 5 minutes. If your attacking host clock drifts beyond this window, pre-auth and service requests will fail with KRB_AP_ERR_SKEW or similar errors. Always sync your time with the DC before Kerberos operations:
+**Check the amazing post from:** [**https://www.tarlogic.com/en/blog/how-kerberos-works/**](https://www.tarlogic.com/en/blog/how-kerberos-works/)
 
-```bash
-sudo ntpdate <dc.fqdn>
-```
-
-For a deep dive on protocol flow and abuse:
-
-**Check the amazing post from:** [https://www.tarlogic.com/en/blog/how-kerberos-works/](https://www.tarlogic.com/en/blog/how-kerberos-works/)
-
-## References
-
-- [How Kerberos Works – Tarlogic](https://www.tarlogic.com/en/blog/how-kerberos-works/)
-- [HTB Sendai – 0xdf (operational notes on clock skew)](https://0xdf.gitlab.io/2025/08/28/htb-sendai.html)
-
-{{#include ../../banners/hacktricks-training.md}}
+{{#include ../../banners/hacktricks-training.md}}