DF flag and not understand what to do help

[mkhaiari@groupe-isia.com]

Hello, and thank you for any help you can provide.

For testing purposes, I have set the firewall to Allow on both WAN and LAN (this is a test environment for a Kubernetes installation).

I am unable to reach https://prod-registry-k8s-io-eu-west-1.s3.dualstack.eu-west-1.amazonaws.com using curl -v. The TCP session is successfully established, but the connection is blocked with the "rule state violation" message. However, I have no issues accessing Google, but other URLs are also blocked.

I considered asymmetric routing, but since Google works fine, that may not be the issue. I also suspected an MTU problem, but after lowering it, there was no impact. I must admit that I am completely stuck.

I don't know which parameter to adjust.
I am running the latest OPNsense update.