Exalogic: TCP Communication Between the Guest VMs Intermittently Fails with Connection Timeout Errors
(Doc ID 2866607.1)
Last updated on MAY 06, 2022
Applies to:Oracle Exalogic Elastic Cloud Software - Version 18.104.22.168.0 and later
Oracle Virtual Server x86-64
Exalogic Virtual Releases 22.214.171.124.X
Exalogic Virtual Releases 126.96.36.199.X
In Exalogic Virtual racks, issue of TCP communication between Guest VMs intermittently failing with Connection Timeout errors is noticed. The issue is noticed on both EoIB and IPoIB networks.
Looking into the TCP dumps of source and destination VMs, for the failed TCP communications we notice that the SYN packets from source VM reached destination VM, but there was no ACK packet from the destination VM.
TCP settings changes at OS level.
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