Re: Fwd: Carto ODBC_FDW issue "ERROR: Connecting to driver" from PG to DB2

This is the error we see in the ODBC trace log

ODBC][586][1523477070.240690][__handles.c][450]
Exit:[SQL_SUCCESS]
Environment = 0x556f874716a0
[ODBC][586][1523477070.240741][SQLSetEnvAttr.c][182]
Entry:
Environment = 0x556f874716a0
Attribute = SQL_ATTR_ODBC_VERSION
Value = 0x3
StrLen = 0
[ODBC][586][1523477070.240762][SQLSetEnvAttr.c][349]
Exit:[SQL_SUCCESS]
[ODBC][586][1523477070.240779][SQLAllocHandle.c][364]
Entry:
Handle Type = 2
Input Handle = 0x556f874716a0
[ODBC][586][1523477070.240804][SQLAllocHandle.c][482]
Exit:[SQL_SUCCESS]
Output Handle = 0x556f874f2000
[ODBC][586][1523477070.240837][SQLDriverConnect.c][687]
Entry:
Connection = 0x556f874f2000
Window Hdl = (nil)
Str In =
[database=SAMPLE;DRIVER=SAMPLE;UID=db2inst1;PWD=********][length
= 55 (SQL_NTS)]
Str Out = 0x7ffd31cf8b60
Str Out Max = 1024
Str Out Ptr = 0x7ffd31cf8b3c
Completion = 1
UNICODE Using encoding ASCII 'ISO8859-1' and UNICODE 'UCS-2LE'

DIAG [08001] [IBM][CLI Driver] SQL30081N A communication error has
been detected. Communication protocol being used: "TCP/IP". Communication
API being used: "SOCKETS". Location where the error was detected: "::1".
Communication function detecting the error: "connect". Protocol specific
error code(s): "99", "*", "*". SQLSTATE=08001

[ODBC][586][1523477070.331477][SQLDriverConnect.c][1273]
Exit:[SQL_ERROR]

The trouble is, we are not convinced of the root cause, as using isql we
can connect to db2 using the same account.

Env details

Db2 server on a docker container on my laptop: IP address 172.17.0.4
Db2 client where postgres server is installed is on a different container.
IP address: 172.17.0.3

Output of db2 list node directory

Node 2 entry:

Node name = MYDB3
Comment =
Directory entry type = LOCAL
Protocol = TCPIP
Hostname = 172.17.0.4
Service name = 50000

output of db2 list db directory

Database alias = SAMPLE
Database name = SAMPLE
Node name = MYDB3
Database release level = 14.00
Comment =
Directory entry type = Remote
Catalog database partition number = -1
Alternate server hostname =
Alternate server port number =

$ cat /etc/odbc.ini
[SAMPLE]
Description = DB2 remote SAMPLE Database
Driver = SAMPLE
servername = 172.17.0.4
system = MYDB3
username = db2inst1
password = db2inst1
port = 50000
PROTOCOL=TCPIP
Debug = 1
Commlog = 1

$ cat /etc/odbcinst.ini
[SAMPLE]
Instance = MYDB3
Description = DB2 ODBC Driver
Driver = /home/db2inst1/sqllib/lib64/libdb2.so
CommLog = 1
FileUsage = 1
#DontDLClose = 1