multitarget tcp application

Products

• Secure Access Cloud

Issue/Introduction

- Secure Access CLoud administrator creates a TCP application with multiple targets

- When users open this application via the user portal, it is suggested to launch one command for each target separately as shown below:

ssh -N -L 2022:EVHUBUDSA0011.dublin.bcom.com:22 tcptunnel@sys-[email protected]
ssh -N -L 2023:EVHUBUDSA0207.dublin.bcom.com:22 tcptunnel@sys-[email protected]
ssh -N -L 2024:EVHUBUDSA0242.dublin.bcom.com:22 tcptunnel@sys-[email protected]
ssh -N -L 2025:EVHUBUDSA0208.dublin.bcom.com:22 tcptunnel@sys-[email protected]

- To avoid creating multiple instances of SSH shells, user wanted to simplify this process and merge the above commands into one using the following:

ssh -N -L 2022:EVHUBUDSA0011.dublin.bcom.com:22 tcptunnel@sys-st[email protected] \
    -L 2023:EVHUBUDSA0207.dublin.bcom.com:22 tcptunnel@sys-st[email protected] \
    -L 2024:EVHUBUDSA0242.dublin.bcom.com:22 tcptunnel@sys-st[email protected] \
    -L 2025:EVHUBUDSA0208.dublin.bcom.com:22 tcptunnel@sys-[email protected]

- This seems to work fine but only the first two ports are being forwarded:

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:2023          0.0.0.0:*               LISTEN      312/ssh
tcp        0      0 127.0.0.1:2022          0.0.0.0:*               LISTEN      312/ssh

- The third and fourth sessions are missing

Environment

Secure Access Cloud

Generic TCPO Application

SSH tunnel commands failing

Cause

SSH syntax problem with application

Resolution

The following command can be used to eliminate several running terminals :

ssh -N -L 2022:EVHUBUDSA0011.dublin.bcom.com:22 \
    -L 2023:EVHUBUDSA0207.dublin.bcom.com:22 \
    -L 2024:EVHUBUDSA0242.dublin.bcom.com:22 \
    -L 2025:EVHUBUDSA0208.dublin.bcom.com:22 \
    tcptunnel@sys-[email protected]