global password change

I have quite a number of sessions setup as tunnel connect (firewall). I have looked all over but I cannot figure out how to globally change my firewall password across all sessions. Can anyone help with this?

So is it (SSH) tunnel or proxy?

In any case, you can use /batchsettings command-line switch:
https://winscp.net/eng/docs/commandline

Thanks. It is SSH Tunnel. Is this run at command prompt? Can you give me a script example to run?

WinSCP.exe /batchsettings * TunnelPasswordPlain=password