[Twisted-Python] Problems with long term connections?

[Marcin Kasperski]

> It occured to me that once a connection has been
> established I might as well leave it open permanently. Are
> there any problems/side effects of doing this? 

Some firewalls (also inteligent routers) may drop connections 
which are inactive for a few (5, 10, depending on 
configurations) minutes. This especially applies in case 
masquerading is in place.