mercurial question (issue with clone of Products.Silva)

Greeting Devs,

Now that Silva 2.3 is out and using the nice mercurial DVCS rather than
subversion, we at Bethel are also setting up a local mercurial server.
We've created downstream 'clones' of the core Silva products which we've
customized.  This should make it easier for us to manage upgrading
Silva, since we have a direct path to the upstream Silva.  

We've configured our mercurial server to operate over https using apache
+ mod_wsgi.  This has worked nicely, however we have one issue with our
clone of Products.Silva.  On my workstation's local clone of
Products.Silva, when I attempt to push a one-line change to our central
hg server (it doesn't matter what it is), I get the following response:

aaltepet@bilbo:~/silva/local-Silva-2.3/src/Products.Silva> hg push
pushing to https://hg.bethel.edu/Products.Silva
searching for changes
abort: HTTP Error 414: Request-URI Too Large

Odd.  There is neither a message in the apache error log nor is this
request recorded in the access log.  

When I instead push to hg.infrae.com, it is successful.

Does anyone have any idea what's going on?

Thanks,
Andy