The damn NVG589 modem on my ATT Uverse internet/phone service failed again today 12/5/15. This post will be a place to keep details of this and subsequent failures. There have been many in the past; I’m sure there will be more.
I put router reset stuff into the home automation system years ago (4/11) to protect against router/modem lockups making the home monitoring system unavailable when we were out of town. The local server pings our ISP’s first router, and if those pings fail for a while, it tried to reset the modem and router (then separate devices) by cycling AC power to them. It took a couple of rounds of rewrites before timing issues causing infinite reset loops were ironed out (oops), but it finally got pretty robust, and automagically kept our internet connection up when we didn’t even know there was a problem. Reset events are posted on the main HA page.
When we switched to Uverse VOIP (when? a year or so ago?), AT&T swapped our old modem for an NVG589 (and started charging us $7/month for it!). That device has internal battery backup (most appropriately for a phone connection), so my dear old power cycling would no longer work. The modem runs off my local UPS, so removing the battery wouldn’t be a show stopper (and would let power cycling work again!), but somehow I haven’t been quite willing to do that. I investigated rebooting the modem programmatically, but at least partly due to a password dialog, I gave up. Now I no longer have automated reboot capabilities. I’ve considered a solenoid striker strapped to the back of the 589 to hit the reset button, but have done no work to implement it. After the latest failure, just removing the battery is looking better and better.
The 589 was replaced a few months after we started with Uverse, basically for the same kind of failure, and I think a guy came out one time since then for similar failures, but didn’t replace it again. There was also a very unpleasant incident with AT&T support where they remotely did a factory reset of the modem when they said they were going to reboot it. That wiped out all my network customizations, Wi-fi SSID and passwords, etc, made me a very unhappy customer, and caused a lot of extra work to get my network back up as it was. I had them put a note in the account file to NEVER do that without expressly asking me. I’d like to back up the config, but several investigations have all pointed to the fact that there is no way to back the config up except looking at the screens and writing everything down! (OK, could take screen captures.) That really sucks, Motorola/Arris.
It looks like rebooting the modem also wipes the logs. I learned that after the reset button reboot today when I tried to go into the logs to see when it first detected a problem. I hope I remember to grab the logs before I reboot it next time.
(last updated 7/2/16) We’re on about the 5th modem now, a Pace 5268. My ping/power cycle stuff is back in place and seems to be working.
Failure event details
(first) Event: 12/5/15 As has happened 3 or 4 times previously, both Internet and phone were out, with the modem showing green on both Broadband lines, green on Service (!) and off for phone line 1. My watchdog noted old file on the host at ~7:30 AM. We noticed internet out about 10 AM. The ping stats display on the home page showed ~1000 missed pings. I showed Laur how to reset the modem, but since it’s hard to get to, that wasn’t pleasant. I need to add bookmarks to browsers on all the devices to check modem status.
I called AT&T service (after it was back up) and complained that the modem knew at least that the phone was out, but didn’t fix itself. The rep (Cara) seemed puzzled that both broadband lights had been green as well as the service light, but internet had been out. She did a remote reboot, and after the usual 15 or 20 minutes it came back up and internet and phone were good (again). She scheduled a service call for Monday AM. She also told me that the My ATT phone app would allow remote rebooting. Cool. I just set that up on Laur’s phone as well as mine. Actually, that reduces the pressure for an auto-restart facility driven by fearing failures while we’re out of town. Of course we’d still like it to fix itself even when we are at home. (Doesn’t actually work: see update 1/18/16.)
While I was still on the phone with her, the modem spontaneously restarted. She offered to wait ’til it was up again, but I said I was pretty confident it would be OK, and I’d call again if it wasn’t. Sure enough, maybe 20 minutes later all was working, and seems to have been OK since. My watchdog noticed the second outage, and again said the datafile on the hosting server was > 1260 seconds old. I wonder if I can get that watchdog to send me a text on failures.
Update 12/6/17: AT&T guy came as scheduled. Did several tests inside and outside with a tester that plugged into my bonded VDSL pairs, saw it sync WAY faster them my modem ever did. He replaced a couple of connectors and the last cable to the modem, but his tester sync’d in less than a minute at the end of the same cable that my 589 took many minutes to sync on. While the modem does usually take a little longer than the tester, the difference was more than he would accept.
He replaced the 589 with a brand new one – same slow sync behavior. Then he replaced that with a new NVG599. That’s bigger, faster, supports high end service. That sync’d up quicker, and that’s what he left in place. Of course I had to reconfigure it with my local network and wifi details, but at least I’d cleverly gotten screen snaps of those bits of config before he came. 🙂 Unfortunately, just like the 589, the 599 has no way to save config info to a file.
Interestingly, my all-but-static IP address changed with the new modem. The little wget-based screen scraper that runs in a cron job to read the gateway’s /cgi-bin/dslstatistics.ha page and emails me if the IP address changes no longer looked for the right hard-coded strings, so I had to touch that up. While the main PC has a fixed address allocated by the DHCP server, and stayed on my non-standard subnet, the nice red laptop in the kitchen runs a normal DHCP client, and so by pulling and replugging its network cable could see the gateway on its default 192.168.1.254 address and let me do the initial config without having to drag a laptop down to the basement and wrassle cables. Much more civilized.
I continue to consider pulling the battery on the 599, but continue to hold off. The home monitor page reports occasional “router resets” – presumably meaning it missed more than 20 consecutive pings (pings every 5 sec). But the ping stats graph doesn’t show any missed pings. I should look into that. But especially with those not consistent, it’s hard to pull that battery.
(a few hours later) OK, there’s one bogus reset reported 12/8/15 06:47. I can’t find any evidence of missed pings near that time. There are a whole bunch of resets mid 12/7, but there’s a big bunch of missed pings at that time as well, so those match up.
Ohhhh… When I was trying to figure out how the reset stuff had been turned off, I’m medium sure I touched a file (presumably “resetFlag”) to see if it got picked up by the main poll program. (It did.) Pingstat.pl writes its ping info (including the critical “got reponse after N…” entries) to pingstats.csv, from which the ping stats graph is made (by graphs.php). But completely separately, when it thinks there should be a reset (power cycle) it touches resetFlag. The main poll program – which of course is the only thing that can talk to the 485 modules – like the power cycle controller – looks for that flag file to know when to send a reset message. The resets reported on the main monitor page come from the main poll program’s datafile.csv – essentially independent of the actual ping stats, linked only by the reliability of pingstat.pl. I broke that reliability by experimentally touching the flag file. So that bogus reset report was truly bogus, created by me trying to figure out how stuff worked. So it can safely be ignored.
That removes the concern about flaky false positive reset requests – yay! I’m still not going to run right over and pull the battery out of the 599, but at least I have confidence (once again) in the reset detection stuff. And I recorded it all here so maybe I won’t break stuff the next time I need to know how it works. 🙂
Update 1/18/16: Discovered that Internet and phone were out again this morning. The good news is that the NVG599 knew about it and was working on it. Unlike the 589, the status page showed broadband and phone down, and from the lights on the front it was clearly trying to resync. The bad news is that after 15 minutes or so, it was still failing.
I thought it would be a great opportunity to test out the remote restart capability the rep told me about in the My AT&T app on my phone. Found the app, logged in, found the U-verse restart screen. There were 2 choices: Automatic and Manual. Since I wanted to test doing it when we’re on vacation, I chose Automatic. Click, whirr – and an error message came up to the effect that this service is not available at this time. Apparently you can only restart the services when they’re already working. That’s dumb, AT&T.
Went downstairs and hit the reset button. In a few minutes, we were back on the air.
Ping stats showed about 350 missed pings (in 2 or 3 batches), for about 29 minutes of outage. The reset algorithm logged 10 tries to restart between 10:38 and 11:14AM. Of course that doesn’t actually do anything right now, but re-enabling it and pulling the 599’s battery is looking better and better.
Update 4/5/16: Service went out again last night. Phone and internet were out suddenly. From router web interface tried to restart phone line, got something like “verification error”. Tried to restart broadband, somehow failed. Restarted device (still from web interface). Eventually got both broadband lights green, service red. Waited a few minutes, gave up and hit red button on back. It rebooted, came back to both broadband LEDs green, service red. Waited more minutes – no change. Called AT&T (from cell). They said they were going to run some tests. Service came back while on the phone – don’t know if it was something they did. Also don’t know if it just took a long time and would have eventually come back after the web interface restart.
Rep (Andrew) said it looked like cabling from NID to modem, and they would send someone out. HA showed ~120 lost pings, 9 “resets” over 38 minutes.
Colin came out today (Tues 4/5) (again tried to go to Villa Park instead of Elmhurst). We talked, but apparently miscommunicated, and he reset modem to Factory, fucking my whole network! He said something about multiple IP addresses but wasn’t clear. I said I thought I was clear to do whatever I wanted on my side of the modem. He replied something like “Well, mostly.” Couldn’t pin him down on what I couldn’t do. What I eventually got out of him was that anything non-stock (changing wi-fi, local subnet, DHCP allocations, etc) increased the risk of something going wrong, for example when an update came down. He said the problems seemed to start Apr 1. I asked if an update had been sent down and he replied quickly that he couldn’t tell anything like that. Nice.
His resets showed up as another 120 missed pings, for 37 minutes of 10 “resets”.
I asked about the MyAtt app only being able to restart service if it was already working. He said if at least some broadband lights were green – like flashing trying to sync – they could talk to the modem enough to restart it. Don’t know if I believe that.
Took advantage of the factory reset to refine my notes on what needs to be done to get back after such a reset. Again used red Gateway to get into modem on default 192.168.1 net. Had to pull the cable to get new IP. Did ipconfig/renew on main PC to refresh its IP. It got its same IP back, and then I was able to tell the modem’s DHCP to always give that IP. Added details on enabling outside access to the Pogo. All details are in My Documents PcSetup/RouterConfig.txt.
Also couldn’t talk to the new TP-Link access point. Lights showed a problem. Power cycled it and it seems to be back on the network. Seems like I couldn’t connect to that AP (Jims G Router) for quite some time. Wonder if it’s been down for months.
I still need to call AT&T: change service addr Villa Park->Elmhurst, and ask for specific answers to when MyAtt app can restart modem.
Update 5/13/16: Got home and found internet and phone down again. Logged into modem; it said broadband was down (as well as phone). At least that was right. Tried to restart broadband, but didn’t help. Hit the red button on the back, and it was back up in a couple of minutes. Why should I have to do that? Ping stats showed 1100 missed pings. At 5 sec/ping, that’s about an hour and a half.
Called AT&T. Rep “Dawn” was friendly and responsive, but couldn’t see anything wrong. Right – it’s all working fine after I hit the reset button. I asked if she could confirm the 90 minute outage my ping stats showed, and she said they couldn’t tell anything like that (in the past). She offered to send someone out, but it didn’t seem worthwhile. She offered to monitor the line for a week, and I said to go ahead with that. My estimate was 95% probability that there would be no problems.
It looks like the problem is that the modem gets stupid and can’t recover. I don’t know how often the modem notices a problem and does reset itself. I suppose that might (better!) be shown in the logs. I think I tried to get the logs sent to the PC, but it probably didn’t work or isn’t working any more.
Hmm – I wonder if the connection between the battery and the modem is accessible. Maybe I could add another relay to the reset node and have it both power cycle and temporarily disconnect the battery. If I just pulled the battery, they might notice it and want to send someone out to fix it. Maybe that solenoid on the reset button isn’t such a bad idea. If it were AC powered, normally retracted (reset button not pushed) and spring loaded normally “pushed”, it would require no additional software changes.
Maybe I should have the reset stuff email me when it kicks in.
Update 6/19/16: Damn modem locked up again – this time while we were away on vacation. According to the 106 “router reset attempts” it was out for about 7 hours. Hit red button when we got home and it all came up promptly – just like every other time. Called AT&T, spoke with “Sherry”. She says there’s a problem with signal to the modem and that’s why it fails. They say that most every time, but I don’t believe it. (I can believe the signal isn’t perfect, but I have trouble believing that’s why the modem locks up and can’t restart itself.) Tech will come out tomorrow morning.
Oops – the time slot I agreed to with the rep on the phone won’t work. My fault. I logged into My AT&T phone app and was able to change the appointment time with no problem. Gold star for AT&T for providing a simple, effective tool for at least that application. Too bad it can’t restart my hung modem, but they do get credit for what does work.
That outage was the straw that broke the camel’s back: I’m going to re-implement my router reset stuff. Found a schematic for the resettable power outlet, and it looks like the PIC node puts out 5V to operate a relay. I should be able to use that to hit the reset button. Looking around for a solenoid I can bolt to the back of the 599 to hit the red button…
Update next day 6/20: Service guy came (to Elmhurst instead of Villa Park – progress!) and swapped the NVG599 out for a Pace 5268AC. Took quite a while to sync, download an update (power LED blinking yellow), install, restart. He said the 5268 was a more stable modem. We’ll see. Reconfigured the new gateway with my network stuff, updated Jim/Documents/PC Setup/RouterConfig.txt. Got new IP address. The user interface on the new modem is completely different, so in addition to slowing me down in setting up the config, it breaks the monthly ‘warm fuzzy IP check’ script (perl/checkip.pl). I made a quick first try at patching it, but failed. Just need a little more time. Update: Fixed.
Set up a syslog 1.2.3 server from Sourceforge on the (now Win10) machine to capture the logs. Seems to function, but won’t log much. Status bar shows messages coming in, but nothing sticks. Still noob playing with it.
We’ll see whether the new modem locks up the same way the 599 did. This one didn’t come with a battery (though there’s a place for one). Guess instead of mechanically pushing the reset button I’ll just hack the timeouts in the existing ping test stuff and enable it so it actually power cycles the new modem.
Update 6/21/16: Touched up pingstat.pl to 30 consecutive missed (5 sec) pings to declare time to restart modem, and dead time between restarts to 500 sec to give the gateway a good chance to resync. Restarted pingstat.pl. Ensured only modem was plugged into controlled outlet, and reconnected the outlet control line to the reset PIC node. I’d cleverly put a well-labelled dummy connector on the same pins and in the same orientation as the wire to the controlled outlet, so reconnecting was trivial. I think it’s all in place and armed. I think.
Update next day 6/22/16: Touched resetFlag, and sure enough it power cycled the modem! Broadband lights came on (red) after about 4:30; Service went solid green after about 6:40, with phone up several seconds later. Since I triggered the reset artificially, the dead time between resets wasn’t in force yet, so I think it detected ping loss while the modem was restarting, and power cycled it again. Main HA page showed 2 resets – again because of touching resetFlag plus one normal ping loss detect plus power cycle. Hooray for having written up how that works above! All is good.
Update 7/1/16: The new 5268 apparently failed today. The good news is that the restart stuff kicked in, power cycled it, and it all came back up automagically. I was on the computer when it went down, and was inconvenienced for a little while, but other than going downstairs and noticing the lights on the 5268 were in a restart pattern and picking up the phone during and after the reset to check, I did nothing to help the process along. I haven’t decided whether to call AT&T about it.
The syslog server seems to work, but doesn’t start or save the filtered log data automatically, so I don’t have the logs from the most recent reboot.
The main HA page showed one reset (07/01 20:34:02) and about 160 missed pings. So as near as I can tell, everything (except log capture) worked perfectly. Yay!
Update 7/7/16: Another fully automatic reset. Didn’t even know about it – it just worked. Main HA page showed about 130 missed pings. At 5 sec/ping and a count of 30, I’d expect more like 150. But the missed ping spike was still completely clear, and I’m confident the reset was justified. I suppose the question of whether the modem might have taken care of it by itself remains. Guess I need to get the logging stable to see if I can infer anything from that.