Not able to reach any services in any namespaces from one particular istio label enabled namespace(getting 502 bad gateway error)

I am running kubernetes as managed service in AWS(EKS). There is one namespace from which I ma not able to reach any services from any other namespaces. Getting 502 bad gateway error. I am able to resolve the svc hostname from my namespace which is having issue, even able to telnet but when I try to hit getting below error

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