Activation Error 'Error getting address for server_name Name or service not known' getting id for server_name (4299862)

The following errors are observed when activating a config file:

sp_ctrl (source_server:9100)> show log reverse

Info     2018-02-15 16:02:31.179189 18826 3744170512 Activation exited with code=1, pid = 18859  (activating datasource o.source_SID)

Error    2018-02-15 16:02:31.177075 18859 2562532816 Compile of "sqltargetconfig" for database o.source_SID failed: No valid tables were found in the config.

Warning  2018-02-15 16:02:31.176660 18859 2562532816 Activation: Invalid route, cannot parse. Skipping (owner.source_table)  (activating datasource o.source_SID) [module ocf]

Notice   2018-02-15 16:02:31.174870 18859 2562532816 Activation: Oracle compatible parameter='11.2.0.0.0'   (activating datasource o.source_SID) [module ocf]

Error    2018-02-15 16:02:30.043256 18859 2562532816 Activation: Error 'Error getting address for server_name: Name or service not known' getting id for server_name  (activating datasource o.source_SID) [module rim]

Notice   2018-02-15 16:02:30.040882 18859 2562532816 Activation: Replicating according to target compatibility of "9.1.0"  (activating datasource o.source_SID) [module sys]

Notice   2018-02-15 16:02:30.040374 18859 2562532816 Activation: Replicating according to target compatibility of "9.1.0"  (activating datasource o.source_SID) [module sys]

Info     2018-02-15 16:02:29.924883 18859 3744170512 Activation launched, pid = 18859  (activating datasource o.source_SID)

Here is the config file:

sp_ctrl (source_server:9100)> view config sqltargetconfig

datasource:o.source_SID

owner.source_table  owner.target_table    target_server@r.target_SID