In the Prod environment, some servers are resolved via Windows DNS and others are resolved via BIND (Linux, AIX, Solaris, etc.) The number of failures in the net_connect log and therefore traffic generated due to net_connect retrying the ping to the server were caused by various factors.
- Failed lookups due to server decommissioning (server no longer exists, and should be removed from monitoring)
- Failed lookups due to change in server domain, e.g., xxxxnez1 (Windows servers), to xxxxnez2 (UNIX, Linux, AIX, Solaris machines)
- No ticket(s) opened for DNS changes not being reported immediately to the UIM Administrator by the DNS team
For now customer can change the retries setting in net_connect to 0, to minimize the effect n the server - being hammered by continuous connection attempts due to consecutive failed lookups. When the DNS/environmental issues are resolved, the retries can be reset to 1, 2 or 3 when the changes are reconciled.