I can't get working the db2 provider with Informix.

I keep getting this error:

ERROR [08001] [IBM] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". Location where the error was detected: "172.16.0.205". Communication function detecting the error: "connect". Protocol specific error code(s): "10060", "*", "*". SQLSTATE=08001

I already checked windows firewall settings as said at https://www.ibm.com/support/pages/sql30081n-communication-error-has-been-detected-errors-when-connecting-controller-application-server-db2-database-server

Program used (.NET5):

string cstr = "Server=172.16.0.205:9094;userid=informix;Password=xxxx;database=testcore;"

conn = new DB2Connection(cstr);

conn.Open();

Informix Server on Linux Version: 12.10

/opt/informix/etc/onconfig.std defines the alias:

DBSERVERNAME informixfullgx

DBSERVERALIASES informixfullgx_drda

/opt/informix/etc/sqlhosts has these lines:

#dbservername nettype hostname servicename options

informixfullgx onsoctcp 172.16.0.205 informix

informixfullgx_drda drsoctcp 172.16.0.205 informix_drda

I also tried to connect using Informix.Net.Core (+ CSDK) from the same machine and it works fine, it connects ok with this code:

var cstr = "Server=informixfullgx;User ID=informix;Password=xxxx;database=testcore;Service=9088";

IfxConnection iconn= new IfxConnection(cstr);

iconn.Open();

Why IBM.Data.Db2 doesn't work?

Any help would be appreciated.

One more data, the file /etc/services also defines:

informix 9088/tcp # Informix server

informix_drda 9094/tcp # Informix server drda