Edgemicro TIME_WAIT

[naganandinimahe]

We see many TIME_WAIT connection from edgemicro server to edgeserver. 300+ TIME_WAIT from each server. Does this 300 connections in edgemicro occupies the Max connection configuration in edgemicro.

[naganandinimahe]

Does anyone see issues with 300+ connection TIME WAIT from edgemicro to edge server/analytics

[imesh]

Would it be possible for you to verify whether these connections are created from Edge Microgateway to Edge Cloud/OPDK Deployment or to target servers of API proxies?

[naganandinimahe]

We could see timeout to Target servers also which is less (<100) but Time wait connections to Edgeserver is more (>300)

[imesh]

According to the manual page of the netstat command TIME_WAIT means following:

The socket is waiting after close to handle packets still in the network. 

We could check following to troubleshoot this issue:

1. Verify whether these connections are created from Edge Microgateway to Edge Cloud/OPDK Deployment or to Target Servers of API proxies. We could use "netstat -anp" command and check "Foreign Address" for this.
2. Check Traffic and Throughout (TPS) at this point of time. This could be checked via API Analytics.
3. Check max_connections and max_connections_hard configuration values:

max_connections: (default: -1) Specifies the maximum number of simultaneous incoming connections that Edge Microgateway can receive. If this number is exceeded, the following status is returned:

res.statusCode = 429; // Too many requests

max_connections_hard: (default: -1) The maximum number of simultaneous requests that Edge Microgateway can receive before shutting down the connection. This setting is intended to thwart denial of service attacks. Typically, set it to a number larger than max_connections.

Reference: https://docs.apigee.com/api-platform/microgateway/2.5.x/operation-and-configuration-reference-edge-m...

Most likely throughput at this point of time may have been high and Edge Microgateway might be still waiting for response messages from Target Servers or Token validation and/or Analytics calls made to Edge Cloud/OPDK Deployment being completed.

[imesh]

Thanks ecomscm, please see below response.