Interactive Brokers allows one active session per username only. If you try to establish a second session, the other session will be disconnected. 

If you want to use the OptraBot in parallel to another TWS session or the Interactive Brokers mobile app where you do manual trading e.g. if you're using separate machines, you'll require an additional user for your Interactive Brokers account.

In order to create an additional user, login to your Interactive Brokers account and navigate to the Settings on the top navigation bar.

On the Settings page navigate to Users & Access Rights at the bottom and click on + in the header of the Users table.

Enter the requested information for the new user and press Continue.

On the User Settings Access page you can leave all checkboxes unchecked as shown below. Press Continue and navigate to the next page.

On the Trading Access page please check the TWS access and the press Continue.

On the Reporting Access page you may uncheck all boxes, because the additional user doesn't require reporting capabilities and continue to the next page.

On the Funding Access page you may uncheck all checkboxes as well, because no funding features are required for the user.

As the additional user is not required to perform any changes in the Account Settings, you uncheck all checkboxes on the Account Settings Access page and press Continue.

If the Client Management Access page appears, you uncheck the CAM checkbox as well and press Continue.

Now you should see the Review Your User Information page and check if everything is OK. Please check that TWS Trading Access is allowed.

After confirming your user information you'll see the Thank you page with a confirmation for the new user request submitted to Interactive Brokers. You confirm this page with Ok.

In the Users & Access Rights overview you'll now see your pending request.

Now log off from Interactive Brokers and log in with the new created user again. You might be asked to set a new password and afterwards to verify your identity. You should have received an email with a verification code which you're asked to enter now and then press Continue.

You now may see that the approval is pending and depending from which country you are, there might be documents required to be submitted from you for getting the user approved.

For German customers which are registered at Interactive Brokers Ireland, the Ireland Interest Tax Form 8-3-6 might be requested. This Youtube Video (https://www.youtube.com/watch?v=VrdyfbJYK3o) provides some information on how to fill out this form and how to proceed with it.

Once your new user has been approved by Interactive Brokers, go on an set the correct trading permissions.

Disclaimer: The above screenshot are taken from the Interactive Brokers website, provided only as a setup guideline and may be changed from time to time subject to Interactive Brokers discretion. QuantX GmbH is not responsible for any losses or damages by inaccuracy and misrepresentation of the information.