### Please describe the problem.
When I use git-annex webapp with a remote IP of a headless computer,
I am sometimes redirected to a 127.0.0.1 address (with a different
port as well)

### What steps will reproduce the problem?
1. Install git-annex as usual.
2. Open git-annex assistant from a headless machine and access the
webapp with the --listen option. (e.g. git annex webapp
--listen=xxx.yyy.zzz.www)
3. Create your first local repository. Then create a second local
repository.
4. When assistant asks you if you want to merge these 2
repositories, try to select the second option (to keep them
separated).
5. You are redirected from your remote IP to 127.0.0.1 to a new port number.

(I also encountered the same error at another menu or function, but
I don't remember where. Sorry.)

### What version of git-annex are you using? On what operating system?
4.20130815
Ubuntu 13.10 64-bit (kernel 3.11.0-13-generic x86_64)

### Please provide any additional information below.
Please ask me for any additional information that may be useful.
