Try OpenEdge Now
skip to main content
ABL Reference
Handle Attributes and Methods Reference : CONNECT( ) method (Socket object)

CONNECT( ) method (Socket object)

Connects a socket to the specified TCP/IP port on the specified host.
Return type: LOGICAL
Applies to: Socket object handle


CONNECT ( [ connection-parms ] )
A character string expression that contains a space-separated list of one or more socket connection parameters.
The following table describes each socket connection parameter, which can be included in this string.
Table 72. Socket connection parameters
-H socket-address
Optional. The host name or IP address to which the connection is to be established.
-S socket-port
The port number for the socket connection. You can specify either an explicit port number or a TCP service name. If you use a TCP service name, the method uses the port number associated with that name in the TCP/IP services file.
If specified, the connection to the server socket uses Secure Sockets Layer (SSL) tunneling.
(Used in conjunction with the -H and -S parameters.)
Note: Be sure you need SSL before using this option. SSL incurs more or less heavy performance penalties, depending on resources and load.
If specified, the connection does not reuse the SSL session ID when reconnecting to the same SSL-enabled server socket.
Note: OpenEdge SSL turns on SSL session reuse by default. So, after the initial connection to a given host (-H) and port (-S), each subsequent connection to the same host and port restarts the SSL session and ignores any different connection parameters that are specified for the subsequent connection, including -nosessionreuse. If you want to change SSL socket options (such as -nohostverify) for each subsequent connection to a given host and port, be sure to specify the -nosessionreuse parameter on the initial SSL socket connection to that same host and port.
If specified, turns off host verification for an SSL-enabled connection to a server socket. Without this parameter specified, the client compares the host name specified in the connection with the Common Name specified in the server certificate, and raises an error if they do not match. With this parameter specified, the client never raises the error. For more information, see OpenEdge® Getting Started: Core Business Services - Security and Auditing.
-pf filename
Optional. A text file containing any of the socket connection parameters described in this table. If this file contains any other OpenEdge startup parameters, this method ignores them.
Note: Connections to an SSL-enabled server socket require the management of public keys on the client (SSL client) and private keys on the server (SSL server). For ABL sockets, the SSL client is the ABL session initiating the SSL connection on a socket object and the SSL server is the ABL session enabling SSL connections on a server socket object. For information on using SSL to secure an ABL socket connection, see the sections on sockets in OpenEdge Development: Programming Interfaces. For more information on SSL and managing private key and digital certificate stores for OpenEdge SSL clients and servers, see OpenEdge Getting Started: Core Business Services - Security and Auditing.
If an error occurs while executing the CONNECT( ) method, the method returns FALSE. Otherwise, it returns TRUE.
When an ABL client (that is not SSL-enabled) calls the CONNECT( ) method and immediately reads data from the socket using the READ( ) method, and an ABL server (that is SSL-enabled) calls the ENABLE-CONNECTIONS( ) method and immediately writes data to the socket using the WRITE( ) method, a deadlock condition can occur. That is, the client is waiting for the server to send data, and the server (regardless of the Write operation) is waiting for the client connection to send data that starts the SSL connection.