Hi @Brent_Sandbrook,
As wizardofoz suggested, definitely give a reboot of the Core machine a try. That will often resolve these types of issues.
If that doesn’t help, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Thanks!