Forum Thread

ASUS RT-N56U: open port UDP 1701/LT2P??

row 1,937 1,778 June 22, 2012 at 09:47 PM
I recently signed up for DirecTV. Whenever I try to access the apps on the HR34 dvr, I get the 301 apps still initializing error. The tech who installed it said it should go away in a day or two. Well fast forward to one month, and the error still occurs. DirecTV said that error is pretty common and that it must be my router settings. For the apps to work, I need to open port UDP 1701/LT2P. Can anyone give me exact instructions on how to do this on an ASUS N56U? I can set-up a basic home network, but I am not too knowledgeable when it comes to messing with the advanced settings. Any help would be appreciated.



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That makes no sense to me.

L2TP is a VPN port, which is odd enough. But you'd only open that port on your router if you needed to access your own network remotely. IOW, from the internet back into your home network. But all you're trying to do is run the apps provided by the DVR, which initiate themselves from inside your network and head OUTBOUND, which should never require opening any ports. In fact, opening the L2TP port on the router is pointlesss without forwarding it to some machine's IP, which they never even suggested. I'd be shocked if opening the L2TP port did anything other than create a vulnerability in your router's firewall.

I wonder if what they really are concerned about is whether you have VPN Pass-Through enabled. I wonder if they're using a VPN client via the DirecTV for security reasons (seems like overkill to me). But that's the only thing I can imagine. That would be bizarre, esp. since not every router supports it.

Being curious, I did a little research on Google, and it appears this recommendation from DirecTV is a standard, canned response. I also see that most of the time it has no effect. The problems persist, or a reboot of the DVR clears things up, although even then the problem may return.

Again, none of this makes any sense. Any rational vendor would secure their communications w/ SSL, which requires nothing special wrt your router (we all use SSL (https) everyday without such requirements). I bet even if you hooked the DVR directly to the modem, it still wouldn't work. Something else is likely amiss here w/ the DVR, imo.
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Last edited by eibgrad June 23, 2012 at 04:13 AM.
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Original Poster
I ended up finding the L2TP Passthrough setting on my router last night after creating this post. I enabled it and also restarted my DVR. Sure enough, the apps and on demand feature started working. Now I'm not sure if enabling L2TP, the restart, or even both caused it to work, but I suppose I can test it again later on by disabling L2TP. Thanks for your input eibgrad.
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