They are pretty tough. Are you sure it's not leaking at the connection and running down the hose?

I believe the connections are called banjo bolts. The bolt passes through the fluid connector in this style. If that's the type you have, you may want to just unbolt it and see if there is an o-ring inside of the bore that could be replaced.

If it's one with a nut that can only be removed with an open-end wrench, try to use a flare-nut wrench to avoid stripping the nut. Fluid lines like those are sometimes found on automotive fluid connections like the brakes and transmission cooler lines.

O-rings are cheap, so maybe you can get lucky. Just be sure to get the right size. If you can, replace any flat metal washers that may be present also. If they exist, they would be quite thin, so don't lose them.

John B.