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5.0.0-rc0 clusters (standalone mongod, mongos) running on macOS, I see many errors like this "ctx":"listener","msg":"Can't set socket option","attr":{"optname":"TCP_KEEPALIVE","error":"Invalid argument"}} The log is flooded with these errors: {"t":{"$date":"2021-06-04T13:16:52.682-07:00"},"s":"E", "c":"NETWORK", "id":23206, "ctx":"listener","msg":"Can't set socket option","attr":{"optname":"TCP_KEEPALIVE","error":"Invalid argument"}} {"t":{"$date":"2021-06-04T13:16:52.682-07:00"},"s":"W", "c":"NETWORK", "id":23023, "ctx":"listener","msg":"Error accepting new connection","attr":{"error":{"code":9001,"codeName":"SocketException","errmsg":"remote_endpoint: Invalid argument"}}} {"t":{"$date":"2021-06-04T13:16:52.682-07:00"},"s":"I", "c":"NETWORK", "id":23018, "ctx":"listener","msg":"Error accepting new connection on local endpoint","attr":{"localEndpoint":"127.0.0.1:27017","error":"Invalid argument"}} The connections that error are coming from an otherwise idle load balancer (haproxy). When a driver connects directly to the mongod/s the error does not occur. What does this error mean and why do these errors occur for haproxy connections? The load balancer is started and stopped with this run-load-balancer.sh script, like this: $ sudo MONGODB_URI='mongodb://localhost:27017,localhost:27018/' .evergreen/run-load-balancer.sh start Starting HAProxy... Single Mongos LB: mongodb://127.0.0.1:8000/?loadBalanced=true Multiple Mongos LB: mongodb://127.0.0.1:8001/?loadBalanced=true $ sudo MONGODB_URI='mongodb://localhost:27017,localhost:27018/' .evergreen/run-load-balancer.sh stop Stopping HAProxy...

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xgen-internal-githook commented on Thu, 17 Mar 2022 16:07:13 +0000: Author: {'name': 'Blake Oler', 'email': 'blake.oler@mongodb.com', 'username': 'BlakeIsBlake'} Message: SERVER-57466 Swallow connection reset-related errors received during ASIO session establishment (cherry picked from commit ffededcdc670d83f4fdf5819f5ab1d9c5750c67c) SERVER-57466 fix windows compile (cherry picked from commit 37595d5ee16f06c964b9d416e5847b99c1a537d8) Branch: LB https://github.com/mongodb/mongo/commit/140b0f4016fc753c14c4e88d2decf37c37c6a60d xgen-internal-githook commented on Wed, 16 Mar 2022 19:39:47 +0000: Author: {'name': 'Blake Oler', 'email': 'blake.oler@mongodb.com', 'username': 'BlakeIsBlake'} Message: SERVER-57466 Swallow connection reset-related errors received during ASIO session establishment (cherry picked from commit ffededcdc670d83f4fdf5819f5ab1d9c5750c67c) SERVER-57466 fix windows compile (cherry picked from commit 37595d5ee16f06c964b9d416e5847b99c1a537d8) Branch: v5.0 https://github.com/mongodb/mongo/commit/ea8eccd0a2210d84493b516e470ebb3df2beca8b xgen-internal-githook commented on Sat, 16 Oct 2021 12:55:55 +0000: Author: {'name': 'Benety Goh', 'email': 'benety@mongodb.com', 'username': 'benety'} Message: SERVER-57466 fix windows compile Branch: master https://github.com/mongodb/mongo/commit/37595d5ee16f06c964b9d416e5847b99c1a537d8 xgen-internal-githook commented on Thu, 14 Oct 2021 21:35:34 +0000: Author: {'name': 'Blake Oler', 'email': 'blake.oler@mongodb.com', 'username': 'BlakeIsBlake'} Message: SERVER-57466 Swallow connection reset-related errors received during ASIO session establishment Branch: master https://github.com/mongodb/mongo/commit/ffededcdc670d83f4fdf5819f5ab1d9c5750c67c shane.harvey commented on Wed, 1 Sep 2021 15:17:31 +0000: Thanks Blake, just FYI this issue is not a blocker. The only side effect here as far as I can tell is that the server logs are flooded NETWORK errors. matthew.saltz commented on Wed, 16 Jun 2021 15:39:05 +0000: Okay, thanks! jeff.yemin commented on Tue, 15 Jun 2021 18:26:25 +0000: That's correct, shane.harvey matthew.saltz commented on Tue, 15 Jun 2021 17:14:16 +0000: shane.harvey Would we need to fix this before 5.0 release?

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