Can't receive syslog from remote web-based app

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fm2022

There's a remote web-based app that can send syslog to an Ip/port. I've installed nxlog on my system and my current nxlog/conf/nxlog.conf file contains these lines

<Input in> Module im_tcp Host 0.0.0.0 Port 1514 Exec parse_syslog(); </Input>

I assume 0.0.0.0 here would mean localhost? However, the web-based app is failing to send the logs. I've pointed a sub-domain to my local machine where nxlog is installed and the web-based app is using the sub-domain to send logs to nxlogs. I'm not sure what goes in the 'host' filed in above lines? Any idea how I should go about debugging this?