I went reading here about transparent proxies:
http://www.oztivo.net/twiki/bin/view...entProxyServer

i went through all this last year being pretty shure my isp didnt use such a thing, did these changes to the tivo files and now i can make calls again give it a go:


1. The easiest and generally best method.
You need to manually edit the config files which name the Emulator (See HowToEditFilesUsingJoe for help on editing). These arer /etc/oztivo.conf and /etc/tclient.conf. oztivo.conf may not exist on some old versions of the OzTiVo image, if this is the case, then just ignore this step. You will need to telnet into your oztivo and do the following:

run the command "rw" to make the disk writable;
use an editor (e.g the joe editor) and edit /etc/oztivo.conf (if it exists): change emulatorport=80 to emulatorport=9090 and
use an editor and edit /etc/tclient.conf: find and change the line starting with #127::65.49.60.197:80::: and change it to 127::65.49.60.197:9090::: then change the line with 127::127.0.0.1:8000::: to #127::127.0.0.1:8000:::
run the command "ro" to make the disk read-only;
reboot the box. and try a daily call.

maybe or isps are mucking around
good luck with it i hope it has fixed my probs ? only time will tell