RMAN connect target database strange error
I got a stange error when i connect to target database in rman.
1、connect target 'sys/oracle@tnsname'
ora-01017:invalid username/password
2、connect target sys/oracle@tnsname
connet succeed
more, SQL*PIUS connect succeed, tnsping is ok, password is correct.
In other environment,both methods are succeed. So strange...
Why using single quotation has different results?
Thanks.