Integrating applications with endpoints using dynamic port negotiation

A system comprising:

• one or more computer processors;
• a memory containing a program which when executed by the one or more computer processors performs an operation, the operation comprising:
• triggering, by an adapter application, a plurality of attempts by a client application to establish a connection to a server application, wherein the adapter application and the client application are both located in a first cloud, wherein each of the plurality of attempts is directed to a predefined static port of a server computer that is located in a second cloud, and wherein the server computer is hosting the server application;
• determining, by the adapter application, based on the plurality of attempts, a set of dynamic remote ports, wherein determining the set of dynamic remote ports comprises:
• for each respective attempt of the plurality of attempts:
• receiving a respective response from the server application, wherein the respective response specifies a respective dynamic port that the client application should use for communications, wherein the respective dynamic port is different than the predefined static port;
• and
• monitoring attempts by the client application to establish a connection to the server application via the respective dynamic port, wherein the determined set of dynamic remote ports includes the predefined static port and one or more dynamic ports that have been used a predefined number of times, and wherein the one or more dynamic ports that have been used a predefined number of times includes a second remote port;
• opening, by the adapter application, a plurality of local ports based on the determined set of dynamic remote ports, wherein the plurality of local ports is located in the first cloud and receives requests from the client application;
• listening, on each respective port of the plurality of local ports, for requests from the client application to the server application;
• and
• upon receiving, from the client application, a first request on a first local port of the plurality of local ports:
• establishing a first secure connection to the second remote port in the set of dynamic remote ports, wherein the second remote port corresponds to the first local port;
• and
• transmitting the first request to the server application via the first secure connection.

A computer program product comprising:

• a computer readable storage medium having computer-readable program code embodied therewith, the computer-readable program code configured to perform an operation, the operation comprising:
• monitoring, by an adapter application, a plurality of attempts by a client application to establish a connection to a server application, wherein the adapter application and the client application are both located in a first cloud, wherein each of the plurality of attempts is directed to a predefined static port of a server computer that is located in a second cloud, and wherein the server computer is hosting the server application;
• determining, by the adapter application, based on the plurality of attempts, a set of dynamic remote ports, wherein determining the set of dynamic remote ports comprises:
• for each respective attempt of the plurality of attempts:
• receiving a respective response from the server application, wherein the respective response specifies a respective dynamic port that the client application should use for communications, wherein the respective dynamic port is different than the predefined static port;
• and
• monitoring attempts by the client application to establish a connection to the server application via the respective dynamic port, wherein the determined set of dynamic remote ports includes the predefined static port and one or more dynamic ports that have been used a predefined number of times, and wherein the one or more dynamic ports that have been used a predefined number of times includes a second remote port;
• opening, by the adapter application, a plurality of local ports based on the determined set of dynamic remote ports, wherein the plurality of local ports is located in the first cloud and receives requests from the client application
• listening, on each respective port of the plurality of local ports, for requests from the client application to the server application;
• and
• upon receiving, from the client application, a first request on a first local port of the plurality of local ports:
• establishing a first secure connection to a second remote port in the set of dynamic remote ports, wherein the second remote port corresponds to the first local port;
• and
• transmitting the first request to the server application via the first secure connection.