Facing Connectivity issues in GRPC Calls ( Upstream connect error or disconnect/reset before headers ) after adding istio as sidecar

[Avani231194]

Error :

\\"message\\\":\\\"14 UNAVAILABLE: upstream connect error or disconnect/reset before headers. reset reason: remote refused stream reset\\\",\\\"code\\\":14,\\\"metadata\\\":{},\\\"details\\\":\\\"upstream connect error or disconnect/reset before headers. reset reason: remote refused stream reset\\\"}\"}"}

**Flow : App 1 --> Istio SideCar --> ALB ( TLS ) --> Istio SideCar ( App 2 ) --> App 2

We tried couple of other flows as mentioned below, but facing the same issue.

App 1 --> ALB ( TLS ) --> Istio SideCar ( App 2 ) --> App 2 App 1 --> Istio SideCar --> ALB ( TLS ) --> App 2

Tried to take TCP Dump on app, and we noticed at the time of issue there are some FIN packages that are being sent.

We are facing this issue only with GRPC calls.

Below is the service file for reference :

` ports:

• name: grpc port: 5001 protocol: TCP targetPort: 5001`

Istio Version: 1.9.2

[highwayliu]

i have met the same issue too.

[highwayliu]

你好，我是刘海伟，QQ 806864128，1310627032，微博 http://weibo.com/1688577641是华南理工09网络工程的学生，你的来信我已收到！请放心！！！

[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2022-04-29. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

Created by the issue and PR lifecycle manager.

[highwayliu]

你好，我是刘海伟，QQ 806864128，1310627032，微博 http://weibo.com/1688577641是华南理工09网络工程的学生，你的来信我已收到！请放心！！！