Error ORA-12560 when trying to connect Windows SQL*Plus client to Oracle 11g Linux server
On your Windows client, you need to specify the TNS alias @ORCL, or else it assumes you're trying to connect to a local database running on your Windows client, which there isn't one.  Also, system as sysdba generally isn't used, not even sure if that makes sense.  SYS as sysdba and just plain system are used.

Enter user-name: system@ORCL
Enter password:

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning option


If you don't have tnsnames.ora set up on your Windows client, you can still connect via EZCONNECT string @"hayer:1522/orcl" instead of setting up tnsnames (yes, the quotes are needed).

Enter user-name: system@"hayer:1522/orcl"
Enter password:

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning option