Datapump import over database link failed with:
ORA-12161: TNS:internal error: partial data received
ORA-12592: TNS:bad packet
Solution was to disable ALG on the Juniper firewall. This is similar to another problem when using SCAN listeners and ALG enabled in the firewall.
Processing object type SCHEMA_EXPORT/TABLE/TABLE
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS [TABLE:"ME"."MYTAB"]
ORA-12161: TNS:internal error: partial data received
ORA-02063: preceding line from MYDB_LINK
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 9001
----- PL/SQL Call Stack -----
object line object
handle number name
3f7ed28b0 20462 package body SYS.KUPW$WORKER
3f7ed28b0 9028 package body SYS.KUPW$WORKER
3f7ed28b0 10935 package body SYS.KUPW$WORKER
3f7ed28b0 2728 package body SYS.KUPW$WORKER
3f7ed28b0 9697 package body SYS.KUPW$WORKER
3f7ed28b0 1775 package body SYS.KUPW$WORKER
3f7c070a8 2 anonymous block
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.DISPATCH_WORK_ITEMS [TABLE:"ME"."MYOTHERTAB"]
ORA-31600: invalid input value 100001 for parameter HANDLE in function CLOSE
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.DBMS_METADATA", line 544
ORA-06512: at "SYS.DBMS_METADATA", line 4187
ORA-06512: at "SYS.DBMS_METADATA", line 1475
ORA-06512: at "SYS.DBMS_METADATA", line 7481
ORA-06512: at "SYS.KUPW$WORKER", line 2792
ORA-02067: transaction or savepoint rollback required
ORA-06512: at "SYS.DBMS_METADATA", line 1475
ORA-06512: at "SYS.DBMS_METADATA", line 7481
ORA-06512: at "SYS.KUPW$WORKER", line 10928
ORA-12592: TNS:bad packet
ORA-02055: distributed update operation failed; rollback required
ORA-02063: preceding lines from MYDB_LINK
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 9001
----- PL/SQL Call Stack -----
object line object
handle number name
3f7ed28b0 20462 package body SYS.KUPW$WORKER
3f7ed28b0 9028 package body SYS.KUPW$WORKER
3f7ed28b0 9831 package body SYS.KUPW$WORKER
3f7ed28b0 1775 package body SYS.KUPW$WORKER
3f7c070a8 2 anonymous block
Job "ME"."IMPDP_TEST_JOB" stopped due to fatal error at 10:52:42