<UM-ip> <Cluster-ip> 4294967295 admin [Wed Jul 22 23:26:01.426805 2020 +0000] "GET /spi/<node3_name>/etc/log/stats/ccma/kernel/opm/489732_000300_1594158901000_0284491.ccma.md5 HTTP/1.1" 200 169 17370 ...<UM-ip> <Cluster-ip> 4294967295 admin [Wed Jul 22 23:26:01.426805 2020 +0000] "GET /spi/<node3_name>/etc/log/stats/ccma/kernel/opm/489732_000300_1594158901000_0284491.ccma.md5 HTTP/1.1" 200 169 17370 - 0 + - - Here we see that for one of the nodes, the response we got from the cluster is HTTP 503, which means service unavailable.