Need help with an ssh connection

Hi.

I have an open ssh connection between two of my servers.  The two machines
are linked across the internet via DSL.

The proble I have is that I opened the connection from the remote machine,
and then drove back home intending to use the open connection to VNC to the
remote machine to do some work on the remote machine from the machine in my
office.

I screwed up the port forwarding, so VNC isn't getting passed through.  I
can't work on the remote machine from here.

I know from experience that an ssh connection will survive an sshd restart,
so what I am looking for is a way to get the sshd to make the port forwarding
changes from here.

Is there any way to make sshd and Putty (Putty is on the remote machine) set
up port forwarding from the remote machine to the local machine without
having to drive back to the remote location?  I won't be able to get back
over there for a few days, and I really need to work on some things over
there.