Unable to create request from kubernetes (GKE) to a SOAP service

Hi I’m unable to make a call request from a service inside our kubernetes in GKE (google) to a SOAP service in other cloud.

I already make a test outside of kubernetes (a VM in google compute Engine) and it work. but I can’t figure out why inside kubernetes was failed to request, it just return ‘false’ when I debug using var_dump (PHP language), and I check on the SOAP service server there was no incoming request.

May someone have experience with this thing ?

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Cluster information:

Kubernetes version: 1.16.15-gke.4300
Cloud being used: (put bare-metal if not on a public cloud)
Installation method:
Host OS: GKE
CNI and version:
CRI and version:

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