https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73153#M25758 Hi Manpreet,<BR /><BR />Here I am using two objects, for session A one object and for session B other object, So I launched session B and performed some operations and closed session B, Now Iam in session A, So here session A is already connected to object but when I am running getting this exception, So Iam trying to detach the application but there is no detach in mainframe, So could please help me with this.<BR /><BR />------------------------------<BR />Rajesh Ramlu<BR />------------------------------<BR /> Fri, 16 Sep 2022 12:22:00 GMT RajeshRamlu 2022-09-16T12:22:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73151#M25756 Hi,<BR />I am working on mainframe application (AS/400), In my senario I launch session A and session B, after performing some of the operation in session B I am reading some data and store in a data item, then I close session B, Now I want to write data item value in session A, When I running the code I getting error like "your program is not connected to a host session. Return code: (1)"<BR />FYI : when I am detaching object manually and attaching again code is working as expected<BR /><BR />------------------------------<BR />Rajesh Ramlu<BR />------------------------------<BR /> Fri, 16 Sep 2022 10:59:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73151#M25756 RajeshRamlu 2022-09-16T10:59:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73152#M25757 Hi <a href="https://community.blueprism.com/t5/user/viewprofilepage/user-id/25448">@RajeshRamlu</a>,<BR /><BR />You have to attach to the host session from Blue prism&nbsp; itself rather than doing it manually. Since you closed the session B, hence Blue Prism lost its touch from Mainframe application. In order to again start working on Session A, you need to attach to the application and then it should work fine.​<BR /><BR />------------------------------<BR />Manpreet Kaur<BR />Manager<BR />Deloitte<BR />------------------------------<BR /> Fri, 16 Sep 2022 12:01:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73152#M25757 ManpreetKaur1 2022-09-16T12:01:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73153#M25758 Hi Manpreet,<BR /><BR />Here I am using two objects, for session A one object and for session B other object, So I launched session B and performed some operations and closed session B, Now Iam in session A, So here session A is already connected to object but when I am running getting this exception, So Iam trying to detach the application but there is no detach in mainframe, So could please help me with this.<BR /><BR />------------------------------<BR />Rajesh Ramlu<BR />------------------------------<BR /> Fri, 16 Sep 2022 12:22:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73153#M25758 RajeshRamlu 2022-09-16T12:22:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73154#M25759 Hi <a href="https://community.blueprism.com/t5/user/viewprofilepage/user-id/25448">@RajeshRamlu</a>,<BR /><BR />Yes you are correct, if you are using a separate object then ideally it should not get disconnected automatically. Now, if it is getting disconnected, did you try attaching to the mainframe using the <STRONG>windows title</STRONG> or the <STRONG>process name</STRONG> and <STRONG>child index</STRONG> combination?​<BR /><BR />------------------------------<BR />Manpreet Kaur<BR />Manager<BR />Deloitte<BR />------------------------------<BR /> Fri, 16 Sep 2022 14:14:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-attach-mainframe-session/m-p/73154#M25759 ManpreetKaur1 2022-09-16T14:14:00Z