Hi,
The error from the log is
2019-07-22T15:30:46.677+05:30 error vmware-converter-worker[14708] [Originator@6876 sub=Default] [Converter Agent SysinfoQuery] while trying to execute "C:\Program Files (x86)\VMware\VMware vCenter Converter Standalone\plink.exe -noprompt -stdin-pass-and-key <ConverterPrivateKeyEnd> -P 22 -thumbprint <emptyThumbprint> root@172.18.115.32 file -L /sbin/init" received error code (1) with result: FATAL ERROR: Network error: Software caused connection abort
You need to have SSH access from the destination VM (not Converter server) to the source machine.
In case that, after fixing the network connectivity, the problem persists, you may also have a look at these (the same symptom may happen due to other reasons; it is theoretically possible that the current issue hides another one):
VMware Knowledge Base
Unable to query the live source machine - from debian wheezy
HTH
Plamen