Database link create but not fatch data from link database give me this err

Question

Sir I create database link with this command system create link
but when I user query then system give me this error you see in blow
SQL> create database link xyz connect to mfatest identified by mfa786 using 'aamir';
Database link created.
SQL> select * from accbal@xyz;
select * from accbal@xyz
ERROR at line 1:
ORA-28546: connection initialization failed, probable Net8 admin error
ORA-02068: following severe error from XYZ
ORA-03113: end-of-file on communication channel
this is same database but diffrent user
scott user
mfatest user
please give me idea how i fatch data from link database/link other user
thank
aamir

Answer 1

On the machine where you get that error does this work ?
SQL> connect mfatest/mfa786@aamir
SQL> select count(*) from accbal;
If it doesn't, please post tnsnames.ora and sqlnet.ora from local machine, and the result, on remote machine, of
C:\> lsnrctl services