Asus RT-N66U Disconnecting Every Couple Hours

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MrXiminoes

Reputable
Oct 19, 2015
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4,510
Hi everyone,

I have searched and searched the forums but have not been able to find a solution to this issue, so I'm posting it here in hopes that someone knows a solution to this. We have an Asus rt-n66u dual band 3x3 wireless n9000 router connected to a motorola surfboard sb6121 modem. On average, every couple hours all devices will drop connection for 2-3 minutes, then all will reconnect automatically. There are two desktop PCs connected via a wired connection, and two laptops connected via wifi. The disconnects seem to be completely random, and not tied to anything we do. They are extremely frustrating, as they often pull me out of online games. Please help us out, any answers will be greatly appreciated.
 
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How does it drop? on all devices? when it drops i would log into the router/ or look at the router lights and see what is going on. If anything i would Check for firmware update. if there is i would do a factory reset, then update firmware, then redo your settings. if there is no update i would do a factory reset.

I would also check modem lights. If the upstream/downstream lights are not green then it is a modem issue.
 
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Thanks for replying! I paid attention to the way it's been disconnecting. First, the connection goes offline. After about 10 seconds, the modem will completely reset itself. All the lights will go off except for the power, and then it will start booting up again. Here are the logs for the last disconnect:
Router:
Oct 20 21:24:12 WAN Connection: Ethernet link down.
Oct 20 21:24:12 stop_nat_rules: apply the redirect_rules!
Oct 20 21:24:30 WAN Connection: Ethernet link up.
Oct 20 21:24:30 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:24:30 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:24:35 WAN Connection: Ethernet link up.
Oct 20 21:24:35 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:24:35 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:24:39 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:24:39 rc_service: udhcpc 560:notify_rc stop_upnp
Oct 20 21:24:39 miniupnpd[477]: received signal 15, good-bye
Oct 20 21:24:39 rc_service: udhcpc 560:notify_rc start_upnp
Oct 20 21:24:39 ddns update: ez-ipupdate: starting...
Oct 20 21:24:39 miniupnpd[591]: HTTP listening on port 54652
Oct 20 21:24:39 miniupnpd[591]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:24:40 WAN Connection: WAN was restored.
Oct 20 21:24:49 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:24:49 ddns update: asusddns_update: 1
Oct 20 21:24:49 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:24:49 ntp: start NTP update
Oct 20 21:24:51 watchdog: start ddns.
Oct 20 21:24:51 rc_service: watchdog 379:notify_rc start_ddns
Oct 20 21:24:51 ddns update: ez-ipupdate: starting...
Oct 20 21:24:51 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:24:51 ddns update: asusddns_update: 1
Oct 20 21:25:18 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:18 rc_service: udhcpc 598:notify_rc stop_upnp
Oct 20 21:25:18 miniupnpd[591]: received signal 15, good-bye
Oct 20 21:25:18 rc_service: udhcpc 598:notify_rc start_upnp
Oct 20 21:25:18 ddns update: ez-ipupdate: starting...
Oct 20 21:25:18 miniupnpd[629]: HTTP listening on port 46460
Oct 20 21:25:18 miniupnpd[629]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:20 WAN Connection: Ethernet link up.
Oct 20 21:25:20 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:25:21 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:25:23 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:23 rc_service: udhcpc 634:notify_rc stop_upnp
Oct 20 21:25:23 miniupnpd[629]: received signal 15, good-bye
Oct 20 21:25:23 rc_service: udhcpc 634:notify_rc start_upnp
Oct 20 21:25:23 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:25:23 ntp: start NTP update
Oct 20 21:25:23 ddns update: ez-ipupdate: starting...
Oct 20 21:25:23 miniupnpd[665]: HTTP listening on port 58491
Oct 20 21:25:23 miniupnpd[665]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:29 WAN Connection: Ethernet link up.
Oct 20 21:25:29 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:25:29 ntp: start NTP update
Oct 20 21:25:29 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:25:31 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:31 rc_service: udhcpc 673:notify_rc stop_upnp
Oct 20 21:25:31 miniupnpd[665]: received signal 15, good-bye
Oct 20 21:25:31 rc_service: udhcpc 673:notify_rc start_upnp
Oct 20 21:25:31 miniupnpd[704]: HTTP listening on port 52206
Oct 20 21:25:31 miniupnpd[704]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:32 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:25:32 ddns update: ez-ipupdate: starting...
Oct 20 21:25:52 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:25:52 ddns update: asusddns_update: 1
Oct 20 21:25:52 ntp: start NTP update
Oct 20 21:25:52 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:26:00 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:26:01 rc_service: udhcpc 711:notify_rc stop_upnp
Oct 20 21:26:01 miniupnpd[704]: received signal 15, good-bye
Oct 20 21:26:01 rc_service: udhcpc 711:notify_rc start_upnp
Oct 20 21:26:01 miniupnpd[742]: HTTP listening on port 51936
Oct 20 21:26:01 miniupnpd[742]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:26:01 ddns update: ez-ipupdate: starting...
Oct 20 21:26:01 ddns update: connected to ns1.asuscomm.com (103.10.4.108) on port 80.
Oct 20 21:26:02 ntp: start NTP update
Oct 20 21:26:04 ddns update: Asus update entry:: return: HTTP/1.1 203 |home.asuscomm.com|home8978.asuscomm.com^M Date: Wed, 21 Oct 2015 04:26:01 GMT^M Server: Apache/2.4.9 (Unix) PHP/5.5.14 OpenSSL/1.0.1h^M X-Powered-By: PHP/5.5.14^M Content-Length: 0^M Content-Type: text/html^M ^M
Oct 20 21:26:04 ddns update: retval= 1, ddns_return_code (,203)
Oct 20 21:26:04 ddns update: asusddns_update: 1
Oct 20 21:26:04 ntp: start NTP update
Oct 20 21:26:04 dhcp client: bound 138.229.182.155 via 138.229.182.1 during 22637 seconds.
Oct 20 21:26:12 WAN Connection: ISP's DHCP did not function properly.
Oct 20 21:26:12 stop_nat_rules: apply the redirect_rules!
Oct 20 21:29:00 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:29:00 rc_service: udhcpc 751:notify_rc stop_upnp
Oct 20 21:29:00 miniupnpd[742]: received signal 15, good-bye
Oct 20 21:29:00 rc_service: udhcpc 751:notify_rc start_upnp
Oct 20 21:29:00 miniupnpd[782]: HTTP listening on port 50076
Oct 20 21:29:00 miniupnpd[782]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:29:00 ddns update: ez-ipupdate: starting...
Oct 20 21:29:01 ddns update: connected to ns1.asuscomm.com (103.10.4.108) on port 80.
Oct 20 21:29:02 WAN Connection: WAN was restored.
Oct 20 21:29:03 ddns update: Asus update entry:: return: HTTP/1.1 203 |home.asuscomm.com|home8978.asuscomm.com^M Date: Wed, 21 Oct 2015 04:29:00 GMT^M Server: Apache/2.4.9 (Unix) PHP/5.5.14 OpenSSL/1.0.1h^M X-Powered-By: PHP/5.5.14^M Content-Length: 0^M Content-Type: text/html^M ^M
Oct 20 21:29:03 ddns update: retval= 1, ddns_return_code (,203)
Oct 20 21:29:03 ddns update: asusddns_update: 1
Oct 20 21:29:03 ntp: start NTP update
Oct 20 21:29:03 dhcp client: bound 138.229.182.155 via 138.229.182.1 during 22458 seconds.

Modem:
Oct 20 2015 21:25:42 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:02 5-Warning D04.1 ToD request sent - No Response received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:25:27 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:25:05 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:01 5-Warning D04.1 ToD request sent - No Response received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:21 3-Critical R07.0 Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=7c:bf:b1:d3:1d:3f;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R07.0 Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:34 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:25 4-Error C401.0 DCC-ACK not received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
 
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Thanks for replying! I paid attention to the way it's been disconnecting. First, the connection goes offline. After about 10 seconds, the modem will completely reset itself. All the lights will go off except for the power, and then it will start booting up again. Here are the logs for the last disconnect:
Router:
Oct 20 21:24:12 WAN Connection: Ethernet link down.
Oct 20 21:24:12 stop_nat_rules: apply the redirect_rules!
Oct 20 21:24:30 WAN Connection: Ethernet link up.
Oct 20 21:24:30 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:24:30 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:24:35 WAN Connection: Ethernet link up.
Oct 20 21:24:35 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:24:35 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:24:39 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:24:39 rc_service: udhcpc 560:notify_rc stop_upnp
Oct 20 21:24:39 miniupnpd[477]: received signal 15, good-bye
Oct 20 21:24:39 rc_service: udhcpc 560:notify_rc start_upnp
Oct 20 21:24:39 ddns update: ez-ipupdate: starting...
Oct 20 21:24:39 miniupnpd[591]: HTTP listening on port 54652
Oct 20 21:24:39 miniupnpd[591]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:24:40 WAN Connection: WAN was restored.
Oct 20 21:24:49 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:24:49 ddns update: asusddns_update: 1
Oct 20 21:24:49 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:24:49 ntp: start NTP update
Oct 20 21:24:51 watchdog: start ddns.
Oct 20 21:24:51 rc_service: watchdog 379:notify_rc start_ddns
Oct 20 21:24:51 ddns update: ez-ipupdate: starting...
Oct 20 21:24:51 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:24:51 ddns update: asusddns_update: 1
Oct 20 21:25:18 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:18 rc_service: udhcpc 598:notify_rc stop_upnp
Oct 20 21:25:18 miniupnpd[591]: received signal 15, good-bye
Oct 20 21:25:18 rc_service: udhcpc 598:notify_rc start_upnp
Oct 20 21:25:18 ddns update: ez-ipupdate: starting...
Oct 20 21:25:18 miniupnpd[629]: HTTP listening on port 46460
Oct 20 21:25:18 miniupnpd[629]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:20 WAN Connection: Ethernet link up.
Oct 20 21:25:20 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:25:21 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:25:23 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:23 rc_service: udhcpc 634:notify_rc stop_upnp
Oct 20 21:25:23 miniupnpd[629]: received signal 15, good-bye
Oct 20 21:25:23 rc_service: udhcpc 634:notify_rc start_upnp
Oct 20 21:25:23 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:25:23 ntp: start NTP update
Oct 20 21:25:23 ddns update: ez-ipupdate: starting...
Oct 20 21:25:23 miniupnpd[665]: HTTP listening on port 58491
Oct 20 21:25:23 miniupnpd[665]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:29 WAN Connection: Ethernet link up.
Oct 20 21:25:29 rc_service: wanduck 342:notify_rc restart_wan_if 0
Oct 20 21:25:29 ntp: start NTP update
Oct 20 21:25:29 kernel: Attempt to kill tasklet from interrupt
Oct 20 21:25:31 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:25:31 rc_service: udhcpc 673:notify_rc stop_upnp
Oct 20 21:25:31 miniupnpd[665]: received signal 15, good-bye
Oct 20 21:25:31 rc_service: udhcpc 673:notify_rc start_upnp
Oct 20 21:25:31 miniupnpd[704]: HTTP listening on port 52206
Oct 20 21:25:31 miniupnpd[704]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:25:32 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:25:32 ddns update: ez-ipupdate: starting...
Oct 20 21:25:52 ddns update: error connecting to ns1.asuscomm.com:80
Oct 20 21:25:52 ddns update: asusddns_update: 1
Oct 20 21:25:52 ntp: start NTP update
Oct 20 21:25:52 dhcp client: bound 192.168.100.10 via 192.168.100.1 during 20 seconds.
Oct 20 21:26:00 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:26:01 rc_service: udhcpc 711:notify_rc stop_upnp
Oct 20 21:26:01 miniupnpd[704]: received signal 15, good-bye
Oct 20 21:26:01 rc_service: udhcpc 711:notify_rc start_upnp
Oct 20 21:26:01 miniupnpd[742]: HTTP listening on port 51936
Oct 20 21:26:01 miniupnpd[742]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:26:01 ddns update: ez-ipupdate: starting...
Oct 20 21:26:01 ddns update: connected to ns1.asuscomm.com (103.10.4.108) on port 80.
Oct 20 21:26:02 ntp: start NTP update
Oct 20 21:26:04 ddns update: Asus update entry:: return: HTTP/1.1 203 |home.asuscomm.com|home8978.asuscomm.com^M Date: Wed, 21 Oct 2015 04:26:01 GMT^M Server: Apache/2.4.9 (Unix) PHP/5.5.14 OpenSSL/1.0.1h^M X-Powered-By: PHP/5.5.14^M Content-Length: 0^M Content-Type: text/html^M ^M
Oct 20 21:26:04 ddns update: retval= 1, ddns_return_code (,203)
Oct 20 21:26:04 ddns update: asusddns_update: 1
Oct 20 21:26:04 ntp: start NTP update
Oct 20 21:26:04 dhcp client: bound 138.229.182.155 via 138.229.182.1 during 22637 seconds.
Oct 20 21:26:12 WAN Connection: ISP's DHCP did not function properly.
Oct 20 21:26:12 stop_nat_rules: apply the redirect_rules!
Oct 20 21:29:00 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Oct 20 21:29:00 rc_service: udhcpc 751:notify_rc stop_upnp
Oct 20 21:29:00 miniupnpd[742]: received signal 15, good-bye
Oct 20 21:29:00 rc_service: udhcpc 751:notify_rc start_upnp
Oct 20 21:29:00 miniupnpd[782]: HTTP listening on port 50076
Oct 20 21:29:00 miniupnpd[782]: Listening for NAT-PMP traffic on port 5351
Oct 20 21:29:00 ddns update: ez-ipupdate: starting...
Oct 20 21:29:01 ddns update: connected to ns1.asuscomm.com (103.10.4.108) on port 80.
Oct 20 21:29:02 WAN Connection: WAN was restored.
Oct 20 21:29:03 ddns update: Asus update entry:: return: HTTP/1.1 203 |home.asuscomm.com|home8978.asuscomm.com^M Date: Wed, 21 Oct 2015 04:29:00 GMT^M Server: Apache/2.4.9 (Unix) PHP/5.5.14 OpenSSL/1.0.1h^M X-Powered-By: PHP/5.5.14^M Content-Length: 0^M Content-Type: text/html^M ^M
Oct 20 21:29:03 ddns update: retval= 1, ddns_return_code (,203)
Oct 20 21:29:03 ddns update: asusddns_update: 1
Oct 20 21:29:03 ntp: start NTP update
Oct 20 21:29:03 dhcp client: bound 138.229.182.155 via 138.229.182.1 during 22458 seconds.

Modem:
Oct 20 2015 21:25:42 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:02 5-Warning D04.1 ToD request sent - No Response received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:25:27 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:25:05 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:01 5-Warning D04.1 ToD request sent - No Response received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:21 3-Critical R07.0 Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=7c:bf:b1😀 3:1d:3f;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R07.0 Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:24:04 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:34 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:25 4-Error C401.0 DCC-ACK not received;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
Oct 20 2015 21:23:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xxx ;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.0;
 
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Yea it is not an issue with your router but your modem. If the modem is provided to you though your ISP I would contact them. If it is something you bought and if it is old i would replace it or if it is new check to see if it under warranty still
 
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