Connect connect to local file server any longer
I have a headless mac mini on my local network that I use as a file server. I have had no issue connecting to it from my macbook until yesterday. I had to factory reset my router/modem combo and since this change I have not been able to access the file server share points. I can still do screen sharing and itunes sharing but I am not able to access the server share points any longer. When I try the "connect as" option from the finder or "go to server" and putting in the servers local address or name. I get a "cannot connect to server" message.
The main change in my router configuration was the LAN set up. I was using 192.253.19.x previously and now I am using 192.168.0.x.
I have tried to remove all instances of keychain references to the server; flushed dns caches; turn file sharing off and then on; shutdown and restart the server; ethernet connect vs wifi; and finally: delete /Library/Preferences/SystemConfiguration/com.apple.network.identification.plist (NON EXISTENT)
and /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
I have also tried to access in safe mode, a guest account and another admin account and not able to access share points there either.
I am at a loss - is this a port issue? Why do screen sharing and itunes sharing work but not file sharing? Any help is greatly appreciated. Thanks!
MacBook Pro, OS X Yosemite (10.10.5)