GitHub user bradh352 added a comment to the discussion: private gateway egress 
deny ACL blocks all traffic?

> > I've observed that when creating a private gateway if my ACL has a deny 
> > egress all rule at the end, then none of the allowed traffic seems to work 
> > with my private gateway. This is different than my network tiers where I 
> > always have a deny egress all rule at the end.
> 
> what are the differences ?

Zero, I literally used my normal common ACL rules that I apply to all 
zones/tiers, plus any zone-specific rules. I just narrowed it down to the 
egress rule being the culprit.

Another interesting note, is in the same subnet as the private gateway, I can't 
even ping the private gateway's ip address with the egress deny all rule in 
place.  Its like its blackholed.

I've attached my working ACL rules.  The non-working rules just have one more 
entry at the bottom with a rule number of 65500 that is a deny egress protocol 
all rule.

[AclRules-hypervisor-346df974-6f58-4a8e-94ab-a6559e7bbf2f.csv](https://github.com/user-attachments/files/22739937/AclRules-hypervisor-346df974-6f58-4a8e-94ab-a6559e7bbf2f.csv)

> 
> > Confusingly as well, there appears to be another unrelated bug. If you 
> > switch to the default_allow rule for testing, then switch back to the ACL 
> > that isn't working ... it continues to work! Ugh .... the only way to know 
> > for sure if it is persistent is to restart the VPC ... who knows what other 
> > rules aren't really being set. This seems like a major issue.
> 
> This issue should have been fixed by #9374 (in 4.19.2) and #10241 (4.20.1) 
> Which ACS version do you use ?

The latest, 4.21.0.  Also, the referenced issues appear to be applying an ACL 
when there are no rules.  There are always rules in my circumstance.

> 
> > Anyone else having this issue or have any hints? I am using a redundant VPC 
> > if that is somehow related.



GitHub link: 
https://github.com/apache/cloudstack/discussions/11796#discussioncomment-14613160

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