3566193 - Cloud Connector - "No buffer space available (maximum connections reached?)" error

Symptom

Connections to all backend systems through SAP Cloud Connector (SCC) were unstable. Messages passing through SCC failed with errors in the ljs_trace.log (<2.17)/scc_core.trc (>=2.17)":

ERROR#com.sap.core.connectivity.spi.processing.AbstractProtocolProcessor#tunnel-client-21-4#Unable to open connection to backend system: No buffer space available (maximum connections reached?): connect: vm-ftp01.w2000.aveve.grp/10.12.8.235:990
io.netty.channel.AbstractChannel$AnnotatedSocketException: No buffer space available (maximum connections reached?): connect: vm-ftp01.w2000.aveve.grp/10.12.8.235:990
Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

Environment

SAP Cloud Connector

Keywords

No buffer space available (maximum connections reached?), No buffer space available, maximum connections reached , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem

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