KBI 310745 Server Is Unreachable And Cannot Be Monitored
Version
All Argent AT products
Date
Friday, 8 Nov 2013
Summary
Target server to be monitored may have multiple network cards and hence have multiple IP addresses, usually on different subnets
When Argent resolves the server hostname through DNS, the IP address is unreachable because there is no network route to that subnet
This usually happens for servers hosting websites or intranet portals, as the hostname is used in the URL of that website which faces the DMZ and thus no network routes are configured for network security
Technical Background
Example server ‘NDCAP3‘ has three network cards and three IP addresses for separate applications
The IP address to be monitored is 177.10.13.15, but in DNS that IP is related to ‘NDCAP3.management.net‘
When Argent queries the DNS server for ‘NDCAP3‘, it receives the IP address in the DMZ which is unreachable causing all Relators run against that Node to fail
Resolution
Access Node Properties from CMDB-X and enter correct IP Address under ‘Alternative IP‘
