We’re getting a large amount of user reports complaining about users not able to use our iOS app because of a gRPC error (where they’ve verified that other apps on the device are continuing to work fine).
Looking at some of these error reports, one of the errors that seems to pop out is: ``` errors resolving ourapphost.googleapis.com:443: [field:hostname lookup error:address lookup failed for ourapphost.googleapis.com.: errorCode: -65568] ``` Looking at the error this seems to map to kDNSServiceErr_Timeout. We reproduced this for a limited time with one of our developers at home only when connected to a specific router and ISP that didn't support IPV6 natively at the time, but there had been some updates and it seemed to start working after a bit so we don't have a reliable repro here anymore. We do know from other signals like reachability that we log that we think the users are online during some of these, so it does seem to be (maybe) be related to gRPC connection problems (and seems to be persistent for these users). We've tried blowing away our gRPC connection and recreating everything if we hit any of these errors and that doesn't seem to help. I'm curious here whether anyone here can help with ideas on how to debug further or have some tips on narrowing down what the problem might be here. -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/grpc-io/97fb05e4-e925-4d15-b6d0-277d716d2f4bn%40googlegroups.com.
