When you try to startup a cluster database:
ORA-00119: invalid specification for system parameter REMOTE_LISTENER
ORA-00132: syntax error or unresolved network name 'name_of_scan:1521'
This issue appears, mostly, after some cluster problems, solved by network reconfigurations, etc.
The workaround is very easy.
First of all, you have to notice there are two sqlnet.ora files. One of them, in the grid home. The second, in the database home.
For the sake of our problem here, important is the bellow database home one.
So, run the db environment script, go to $TNS_ADMIN folder and observe the lack of the EZCONNECT method in the sqlnet.ora file. Be sure it will be:
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
Then, everything will work like a charm. Enjoy!