I've noticed that using Linux hot-add proxies results in transient quite random backup/replication failures.
No support ticket yet as I'm not quite sure that our network is blameless, but I'm not scratching my head a bit about where to look further to provide some hints to support. However it mostly happens to proxy that is closest to backup server (same datacenter, same subnet/VLAN). Remote proxies (another country over IPsec) have much lower error rate (but not zero), also SAN proxies see almost no errors. Nothing dramatic (always recovers during retry) but it's quite annoying as it consistently triggers monitoring alarms.
So far I've applied SSH changes here https://www.veeam.com/kb2985
and it seems to have reduced at least some errors but not fully. KB article is about repositories but proxies have a lot of SSH connections as well and it's possibly not updated as Linux proxies is quite new functionality.
Has anyone noticed anything similar?