One computer can't connect to the Synology

I have a Windows 2019 Server that can't browse to or ping my Synology. The Synology is a DS1010+ running DSM 5.2-5967 Update 9. The Server firewall is off while troubleshooting.

Other computers on the network can browse and ping the Synology.

To test connectivity from the Synology, I used SSH to log into the Synology and I am able to ping the server that is having trouble. The server's IP is listed in the Allow List in Control Panel...Auto Block. I've verified it is NOT in the Block List.

I've reboot both systems a few times. Has anyone had this problem and found a fix? (I have done many searches and nothing I've seen so far has helped.)

Thanks.