Upstream server error

#1

Hello Istio team,

I see following error in one of my calls:

"2019/04/25 18:11:11 [warn] 9#9: *77 upstream server temporarily disabled while connecting to upstream, client: 127.0.0.1, server: *.k.com, request: “PUT /api/walletapi/wallet/v1/items/lookup/?includeGPOs=true HTTP/1.1”, upstream: “https://[2600:1407:16:3af::3a2f]:443/wallet/v1/items/lookup/?includeGPOs=true”, host: “istio-gke.lle-mcommerce.k.com”, referrer: “https://istio-gke.lle-mcommerce.k.com/walletpage

I already have “*.k.com” in serviceentry.