getting time out while exporting metrics to OAP

[trs91km]

I configured opentelemetry to get metrics for VM monitoring, while exporting it to OAP with gRPC, I am getting below error.

2021-11-07T16:34:54.401Z warn batchprocessor/batch_processor.go:185 Sender failed {"kind": "processor", "name": "batch", "error": "MetricsServiceClient: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp X.X.X.X:11800: i/o timeout""}

port 11800 is listening in my OAP server
[root@xxxxxxx ~]# netstat -tnpl | grep -i 11800
tcp6 0 0 :::11800 :::* LISTEN 2081907/java

on application.yml, I have settings below

receiver-otel:
selector: ${SW_OTEL_RECEIVER:default}
default:
enabledHandlers: ${SW_OTEL_RECEIVER_ENABLED_HANDLERS:"oc"}
enabledOcRules: ${SW_OTEL_RECEIVER_ENABLED_OC_RULES:"vm"}

from log -> skywalking-oap-server.log
2021-11-07 07:37:37,147 - org.apache.skywalking.oap.server.library.server.grpc.GRPCServer - 142 [main] INFO [] - Bind handler AccessLogServiceGRPCHandlerV3 into gRPC server 0.0.0.0:11800

on DB I see tables created for VM monitoring. I am using MSQL as storage, I can fetch metrics of OAP server but having issue with exporting metrics to OAP server for VM monitoring. Please assist.

[wu-sheng]

How to export metrics through OpenTelemetry and why it timeout, are not this community responsibility.
Please ask to OpenTelemetry community.