ASUS RT-N66U Port forwarding issue

[knightowl]

I have a ASUS RT66U router, which was running Merlin RT-N66U_378.56_2 for months with no issues. I had port forwarding setup and devices on my network were contactable from outside my LAN. ASUS since then have made a change to their firmware in such when you upgrade, you can no longer downgrade.
Since I have upgraded to the latest merlin firmware RT-N66U_380.61_0 Everything works apart from port forwarding. I have done a hard reset on the device and setup my ISP connection, wifi, port forwarding - same issue as before. I have a static IP address, so I know my IP hasn't changes causing a problem with my devices finding my router.
I've attached the message I get when I attempt to download the firmware.

I have tried everything I can think of. Nothing on my home network has changed as it was working prior to the firmware upgrade.

Any ideas? Thanks in advance

 

[latinkreationz]

I just upgraded our N66U on Friday which was running 380.58 and have no issues with port forwarding.


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[knightowl]

Thanks for your reply. Still can't get my head round it. Might do another factory reset.

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[john9527]

Check your nvram utilization on the Tools page. If you are running low on nvram space, one of the first things to be affected are port forwards.
See this thread for a similar problem
http://www.snbforums.com/threads/asuswrt-merlin-380-59-ac68u-port-fwd-apply-fail.33895/

 

[knightowl]

Thanks john9527, Followed the advice given there and cleared out the nvram which in turn resets the device and puts it back to factory default settings. Set everything up manually and I've still got the same issue.

 

[knightowl]

By the way the nvram is now

45859 / 65536 bytes

After I have reconnected.

 

[TeHashX]

On firewall page choose Merlin as Nat Loopback.

 

[knightowl]

Thanks just giving that a go now. It was on Asus, changed to Merlin and I'm just rebooting it.

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[knightowl]

Same issue. It is set to Merlin for the loop back but no change.

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[RMerlin]

How are you testing it?

 

[knightowl]

Dropping off WiFi to 4g on my phone. Trying to connect to my cameras and also trying ftp from another location. The ftps kind of works but it is not able to display the directory.

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[TeHashX]

Try this http://www.canyouseeme.org

 

[knightowl]

Thanks TeHashX. That's odd so it says success on the ports but it's like when a connection has been made it does authenticate or do the handshake. Wht I dont get is that everything worked prior to the update.

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[knightowl]

Dropping off WiFi to 4g on my phone. Trying to connect to my cameras and also trying ftp from another location. The ftps kind of works but it is not able to display the directory.

Sent from my SM-G920F using Tapatalk

Thanks TeHashX. That's odd so it says success on the ports but it's like when a connection has been made it doesnt authenticate or do the handshake. What I dont get is that everything worked prior to the update.

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[knightowl]

So I did an ftp test from ftp test.net
This is the result
Results
Error: Connection timed out
Timeouts are usually caused by some router and/or firewall that is interrupting the connection.
Try uninstalling all firewalls and plug your computer directly into your modem, thus bypassing the router.

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[knightowl]

Is there a way of downgrading the firmware?

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[ColinTaylor]

Is there a way of downgrading the firmware?

As I understand it you have to put the router into "recovery mode" to install the older firmwares.

 

[knightowl]

Thanks Colin. Will give it a go later.

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[knightowl]

Ended up restoring back to the old firmware. Everything works again. Ta

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