ORA-28500: connection Error

Question

I am using Oracle gateway for sqlserver 11.2 on Oracle 11.2 database on Linux.
When i run the following query:
select * from prc.PrcIsr@sqlserver;
then after displaying about 10,000 rows, i get the following error message:
ERROR:
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
ORA-02063: preceding line from SQLSERVERThis error comes for all the tables except for minor tables having less than 1000 rows.
Followings are the contents from the trace file:
hgopoer, line 233: got native error 5701 and sqlstate 01000; message follows...
[Oracle][ODBC SQL Server Driver][SQL Server]Changed database context to 'qai'. {01000,NativeErr = 5701}[Oracle][ODBC SQL Server Driver][SQL Server]Changed language setting to us_english. {01000,NativeErr = 5703}[Oracle][ODBC SQL Server Driver]Invalid connection string attribute {01S00}
Exiting hgopoer, rc=0 at 2011/10/12-07:01:30
hgocont, line 2685: calling SqlDriverConnect got sqlstate 01000
Entered hgolosf at 2011/10/12-07:01:30
Exiting hgolosf, rc=0 at 2011/10/12-07:01:30
DriverName:HGmsss23.so, DriverVer:06.00.0056 (b0041, U0039)
DBMS Name:Microsoft SQL Server, DBMS Version:09.00.4060
Exiting hgocont, rc=0 at 2011/10/12-07:01:30 with error ptr FILE:hgocont.c LINE:2685 FUNCTION:hgocont() ID:SQLDriverConnect
SQLGetInfo returns Y for SQL_CATALOG_NAME
hgopoer, line 233: got native error 104 and sqlstate 01000; message follows...
[Oracle][ODBC SQL Server Driver][libssclient24]ConnectionRead (recv()). {01000,NativeErr = 104}[Oracle][ODBC SQL Server Driver][libssclient24]General network error. Check your network documentation. {08S01,NativeErr = 11}
Exiting hgopoer, rc=0 at 2011/10/12-07:03:27
hgoftch, line 730: calling SQLFetch got sqlstate 01000
0 rows fetched
Exiting hgoftch, rc=28500 at 2011/10/12-07:03:27 with error ptr FILE:hgoftch.c LINE:730 FUNCTION:hgoftch() ID:Fetch resultset data
Listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.18.2.134)(PORT = 1521))
ADR_BASE_LISTENER = /u01/app/oracle
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = dg4msql)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
      (PROGRAM = dg4msql)
sqlnet.ora
# sqlnet.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ADR_BASE = /u01/app/oracle
initdg4msql.ora
# This is a customized agent init file that contains the HS parameters
# that are needed for the Database Gateway for Microsoft SQL Server
# HS init parameters
HS_FDS_CONNECT_INFO=[zeus.lhr.com]:1433//qai
# alternate connect format is hostname/serverinstance/databasename
HS_FDS_TRACE_LEVEL=DEBUG
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
# custom init parameters
HS_KEEP_REMOTE_COLUMN_SIZE=LOCAL
HS_NLS_LENGTH_SEMANTICS=CHAR
HS_LANGUAGE=AMERICAN_AMERICA.WE8MSWIN1252
HS_NLS_NCHAR=UCS2

Answer 1

the provided trace file doesn't even show the read error.
It suddenly ends in the middle of a fetch:
SQLFetch: row: 27, column 4, bflsz: 16, bflar: -1
SQLFetch: row: 27, column 4, bflsz: 16, bflar: SQL_NULL_DATA
SQLFetch: row: 27, column 5, bflsz: 16, bflar: 16
SQLFetch: row: 27, column 5, bflsz: 16, bflar: 16, (bfl: 16, mbl: 16)
00: B80B0200 1C000000 00000000 00000000 [................]
SQLFetch: row: 27, column 6, bflsz: 4, bflar: 2
SQLFetch: row: 27, column 6, bflsz: 4, bflar: 2
Just to clarify - did you abort the fetch?
What about your network environment - are all machines located in the same network or is for example the SQL Server located outside of your network?
Is there an rdbms/log directory in your OH /u01/app/oracle/product/11.2.0/db_1?
If yes, does it contain a dump file dated with 2011/10/12-08:04:54?
If there is no rdbms/log directory, please create it and retry the select.
BTW, there's already dg4msql 11.2.0.2 and for some platforms also 11.2.0.3 available. Could you also please make sure you use the latest release?