Cannot connect to Windows SMB share

Hey, this problem is frustrating my beyond belief. I've recently bought my first mac (mac mini) and frequently access a shared driver that is hosted on a Windows server. Until today I have no issues by going into finder and typing smb://ip or hostname here

However, today I get

"There was an error connecting to the server "server". Check the server name or ip address and try again".

The same problem occurs when I try to access it by ip address.

I can ping the particular Windows computer just fine in terminal by both host name and ip. I know that sharing works because it's fine on other Windows computers. It seems the problem is in Finder. I have made no changes at all since the last time it worked. I'm still a Mac newbie so I would really appreciate some help. Thanks.