Inquiry Regarding Error "0 DC downstream_remote_disconnect" in Istio

[EmiBruno]

Dear Istio Support Team,

I am writing to seek assistance regarding an error encountered within our Istio deployment. We have recently observed an issue with the error code "0 DC downstream_remote_disconnect" appearing in our logs.

Here are the specifics of the error:

Error Code: 0 DC downstream_remote_disconnect

Description of the Problem:
Our application container did not receive any requests for approximately 30 minutes from the Istio-proxy container. However, after this period, the application started to function correctly again without any intervention.

Helm Configuration Details:
istio_base_version: "1.20.3"
istiod_version: "1.20.3"
istio_ingressgateway_version: "1.20.3"

We would greatly appreciate it if you could provide us with insights into the following:

• What does the error code "0 DC downstream_remote_disconnect" signify in the context of Istio?
• What could be the potential causes for this error occurring intermittently?
• Are there any recommended troubleshooting steps or configurations to prevent or mitigate such occurrences in the future?

Additionally, if there are any specific logs or diagnostic information that would be helpful in diagnosing this issue, please let us know, and we will be more than happy to provide them.

Thank you very much for your attention to this matter. We look forward to your prompt response and assistance in resolving this issue.

Best regards,
Emilio