International Business Machines Corporation

Richard G Hartmann

Jeffrey Scott Stevens

Paul Francis Rieth

Daniel L Krissell

Francine M Orzel

Thomas Edwin Murphy, Jr

Thomas E Murphy

Gilford F Martino

Vincent T Timon, Iii

Michael J Herceg

A method and system for establishing and maintaining a connection in a client/server environment is disclosed. A client requests a connection from a server, and the client and server negotiate environment options to establish the connection including a recovery location comprising, in one example, an IP address and port. The server stores the recovery location received from the client in a recovery information file. In response to losing the connection with the server, the client checks the recovery location for a recovery notification sent by the server. When the server is re-started, a recovery notification is sent by the server to the recovery location that was stored in the recovery information file. The client receives this recovery notification, and the connection between the client and the server is re-established without the need for the client to query the server.

Dynamic client/server session recovery in a heterogenous computer network

A system and method for supporting character interactive input/output operation in a half-duplex block-mode environment including a workstation and a server. Keystrokes at the workstation received into an auto enter, non-display entity on the workstation display are automatically transferred as entered from the workstation to a server application which processes the keystroke and responds in a manner appropriate to the context of the application.

Character interactive input/output

A system and method for operating a Telnet client to establish a network connection with a Telnet server. Environment parameters are negotiated for establishing a connection-oriented connection of the client to the server, the parameters optionally including a request for the server to provide a custom confirmation record. Responsive to that request, the server provides a custom confirmation record to the client selectively including default or defined custom information generated according to a customer provided exit program.

Server display confirmation record response in a connection oriented client/server protocol

System and method for providing character interactive input/output

The present invention provides a method, system and program product for dynamically detecting an errant data sequence transmitted over a network and performing a corresponding action. Specifically, a data sequence is received by a server from a client and compared to a definable data structure. The data structure comprises rules that each correspond to a state of communication between the server and the client. Each rule sets forth a predetermined data sequence, an optional condition and an action. If the received data sequence: (1) matches one of the predetermined data sequences in the data structure; (2) is relevant to (was received during) the state of communication to which the matched predetermined data sequence corresponds; and (3) meets any enumerated conditions, a corresponding action is implemented.

Method, system and program product for dynamically detecting errant data sequences and performing corresponding actions

A system and method for conducting an interactive event dialog on a half duplex block mode connection between a first server and a client and optionally on a full duplex mode connection between a client display based application and a second server. The interactive event processing capabilities of the client are determined and either stored for future use in a logical unit descriptor and referenced by the server in response to a request from the client to interface a local client based display application, or else determined by the first server at the time of that request. Further responsive to the request from the client and determining that the client is capable of interactive event processing a client display based application negotiates an encoding scheme acceptable to said client and communicates with respect to the client in half duplex block mode encoded in accordance with the negotiated encoding scheme and optionally with respect the second server in full duplex mode.

A user desiring to retrieve any multimedia document (such as image, sound, audio, video, text) is provided the ability to select the size of the document desired. The HTTP protocol HEAD method is used for extracting content length and content type from the server. Whether the client browser requests the document or not is based on the content length and content type sent in the header served to the browser by the server and the minimum or maximum size selected by the user for the relevant type. If the content size is not within the parameters defined by the user, the document will not be requested or served on the network.

System and method for variable size retrieval of webpage data

Graphics enabled applications run on a text-based host server by allowing a client application running at a workstation to inform the server of this session (1) that it, the client application, is graphics capable and (2) the IP address and port(s) it is waiting on; and then by having the server set capability indicia, such as RAWT attributes, in the operating system for this session to indicate the (1) the client is graphics enabled, (2) the IP address and port(s) it is waiting on, (3) optionally, the path to an application to be automatically launched.

System and method for enabling graphic applications in an interactive programming model

A system and method for operating a Telnet client to establish a network connection with a Telnet server. Environment parameters are negotiated for establishing a connection-oriented connection of the client to the server, the parameters including a explicit or implicit request for the server to provide a confirmation record. Responsive to that request, the server provides a confirmation record to the client selectively including the virtual device name assigned randomly, automatically, or explicitly to the connection by the server, system kernel, exit programs, or system policies (regardless of the virtual device name requested by the attaching client device), or a return code indicative of a cause for failure to establish the connection.

System and method for server display confirmation record response in a connection oriented client / server protocol

A system and method for monitoring and controlling the total number of SSL port resources that are allowed to be tied up by a malicious or inept client making multiple requests from a single IP address. Smart SSL handshake timeout detection is used to track and deny service to any SSL clients that do denial of service (DOS) attacks.

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Endicott, NY, United States of America

Richard G Hartmann