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Strange issue with 2.4GHz wifi on RT-AC86U

jata

Regular Contributor
Hi all - I hope to get some help on this but i think i have tried everything (and failed)...

Situation is:
  • long-term user of RT-AC86U with merlin
  • Running 348.18 everything fine
  • 2 weeks ago noticed wifi printer wasn't working (my only 2.4Ghz device)
  • investigated and noticed that couldn't connect anything to the 2.4Ghz wifi
So I decided to do a factory reset following the nuclear reset instructions and loaded the stock asus firmware but I still had the same issue.

Then i did another nuclear reset but have used the merlin 348.19 beta 2 fw and completed the minimum config/setup with my 2.4 and 5GHz on separate SSIDs with fixed channels and the suggested wifi config (diasbled universal beamforming and airtime fairness). Unfortunately I still have the issue. Current status is:
  • using clean merlin 348.19b2 fw
  • used unused SSID - following instructions around naming for SSID and pwd
  • I successfully connected my iphone to the 2.4Ghz network once but it gets disconnected after approx 30 seconds
  • after this disconnect, i can't connect again and the error message on my phone is that the password is incorrect
  • if I change the password for the 2.4GHz network I can successfully connect again once for 30 seconds...
Has anyone seen anything like this before?

I have logging tuned to max and happy to post if that would help troubleshooting.

I am can also ssh into the device to get more info if helpful (but I will need a little assistance as i'm not an expert).

Thanks in advance for any assistance.
 

Neil62

Senior Member
Hi all - I hope to get some help on this but i think i have tried everything (and failed)...

Situation is:
  • long-term user of RT-AC86U with merlin
  • Running 348.18 everything fine
  • 2 weeks ago noticed wifi printer wasn't working (my only 2.4Ghz device)
  • investigated and noticed that couldn't connect anything to the 2.4Ghz wifi
So I decided to do a factory reset following the nuclear reset instructions and loaded the stock asus firmware but I still had the same issue.

Then i did another nuclear reset but have used the merlin 348.19 beta 2 fw and completed the minimum config/setup with my 2.4 and 5GHz on separate SSIDs with fixed channels and the suggested wifi config (diasbled universal beamforming and airtime fairness). Unfortunately I still have the issue. Current status is:
  • using clean merlin 348.19b2 fw
  • used unused SSID - following instructions around naming for SSID and pwd
  • I successfully connected my iphone to the 2.4Ghz network once but it gets disconnected after approx 30 seconds
  • after this disconnect, i can't connect again and the error message on my phone is that the password is incorrect
  • if I change the password for the 2.4GHz network I can successfully connect again once for 30 seconds...
Has anyone seen anything like this before?

I have logging tuned to max and happy to post if that would help troubleshooting.

I am can also ssh into the device to get more info if helpful (but I will need a little assistance as i'm not an expert).

Thanks in advance for any assistance.
Have you tried using the ASUS restoration tool for the 86U? Maybe worth a try.
 

jata

Regular Contributor
Does anyone think it is worth restoring to an older merlin firmware (if there is one quite recent before significant changes to wifi code/drivers/blobs etc)?
 

tyreman

Regular Contributor
Where is the router vs the equipment connected? router downstairs
Install the printer software and should be good to go
I have a brother and no issues
if you tried asus fw still no go? and router is fine that sort of says its printer issue or how its setup including positioning in building with router
as far as iphones some settings may have to be disabled or tweaked to get them to work reliably often
 

OzarkEdge

Part of the Furniture
Does anyone think it is worth restoring to an older merlin firmware (if there is one quite recent before significant changes to wifi code/drivers/blobs etc)?
Have you tested with another 2.4 client?

Given the longtime/old AC86U (they have suspect hardware) and a 2.4 issue, I would suspect hardware failure or issue with current firmware. So yes, revert to stock firmware 81858... if that doesn't work, it may be the hardware.

Downgrading will require a reset before you login to the webUI because Asus added login encryption in more recent firmware. You should reset anyway before configuration from scratch.

OE
 

TheMorpN

Regular Contributor
I have roughly the same issue with my AC86U node. I noticed the following:
- After a few days, the node's 2.4ghz stops working (there are no longer any 2.4 ghz connections to the node after 2 days or so)
- A reboot is the only thing that fixes this
- Have tried using the latest "stock" Asus firmware along with merlin 348.18

I did put in place a reboot script on the node, which reboots every 2 days at 3am, which works, for the most part, however I noticed that every once in awhile, after it reboots, the router does not complete it's reboot cycle. Meaning, that after it starts it's reboot, the LED lights power off and they stay off, so the reboot never completes.

Any thoughts?

EDIT: I just reverted to stock firmware 81858 as mentioned by @OzarkEdge I will see what happens in the next few days.
 
Last edited:

jata

Regular Contributor
thanks everyone for your suggestions.

I have done a restore using the restore utility and it didn't help.

my last test is going to be going back to the 81858 firmware and i will report back.

Note that my main finding so far is that the 2.4 wifi refuses to connect with any client. When i use my phone to connect the error is incorrect password - but the password is correct. 5Ghz wifi works fine.

I have no interference as there is very little congestion where I live and everything was working fine until suddenly dying...

my router is less than 2yrs old - do you think ASUS will do a RMA replacement (in Australia)?
 

jata

Regular Contributor
so my wife is getting very annoyed with me stuffing around with the wifi router all weekend...

Have now tried the stock 81858 firmware (and latest stock firmware a few times). Also tried a couple of merlin firmwares and each time doing the nuclear resets. exactly same issue across all firmware versions.

Issue is only on the 2.4ghz network but i need 2.4 for our wifi printer so that is it for my rt-ac86u - unless i can get it repaired by asus. Annoying as it is an expensive router and I was loving the merlin firmware and all the addons available through this community.

I have gone back to my trusty apple airport extreme bought in 2009 (so the N model not AC) and this thing is still working fine.
 

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