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  1. #1

    C7v2 / AC1750 2.4Ghz Radio Intermittent (at best)

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    Hello - Joining the many - what seems unsolved - threads of 2.4Ghz WLAN networks that are going down without any indication why. 5Ghz interface works fine when 2.4 is going out. Can connect to radio, however DHCP fails with client.

    I've had the router for about 5 months, has worked great until the last week or so. I upgraded the firmware maybe a month ago.

    Troubleshooting and behaviour:

    Reboot router, 2.4 devices can connect to radio for period of time and then connectivity stops. I have 2.4 capable only devices in my network so this is problematic.
    When 2.4 is down, on 5Ghz capable devices switch SSIDs - connectivity resumes through 5Ghz.

    SSIDs are uniquely named (albeit only 1 character difference)
    Log is flooded with DHCP INFO/WARN entries. Not sure if this is related to post-reboot negotiation yet. Need to clear log and watch timestamps when it fails next.



    Device info:

    Firmware Version: 3.15.2 Build 170525 Rel.37571n
    Hardware Version: Archer C7 v2 00000000


    Log:

    ################################################## ##################
    # Archer C7 System Log
    # Time = 2017-11-06 22:41:05 13563s
    # H-Ver = Archer C7 v2 00000000 : S-Ver = 3.15.2 Build 170525 Rel.37571n
    # L = 192.168.0.1 : M = 255.255.255.0
    # W1 = DHCP : W = 69.180.175.220 : M = 255.255.252.0 : G = 69.180.172.1
    ################################################## ##################

    Nov 6 22:30:47 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:30:52 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:30:52 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:30:52 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:30:52 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:30:53 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:30:53 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:30:53 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:30:56 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:30:56 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:31:02 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:31:02 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:31:02 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:31:18 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:31:18 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:31:18 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:31:20 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:31:20 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:31:23 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:31:23 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:31:23 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:31:24 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:31:24 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:31:25 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:31:25 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:31:29 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:31:29 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:31:37 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:31:37 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:31:41 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:31:41 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:31:41 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:31:48 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:31:48 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:31:48 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:31:54 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:31:54 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:31:58 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:31:58 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:31:59 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:31:59 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:02 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:32:02 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:11 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:32:11 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:11 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:32:11 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:32:11 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:32:18 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:32:18 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:32:18 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:32:27 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:32:27 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:32:30 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:32:30 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:32:32 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:32:32 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:35 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:32:35 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:41 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:32:41 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:32:41 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:32:42 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:32:42 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:32:50 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:32:50 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:32:50 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:33:00 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:33:00 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:33:04 DHCP INFO DHCPS:Recv REQUEST from 44:65:0D:69:15:34
    Nov 6 22:33:04 DHCP INFO DHCPS:Send ACK to 192.168.0.105
    Nov 6 22:33:05 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:33:05 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:33:08 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:33:08 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:33:13 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:33:13 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:33:13 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:33:17 DHCP INFO DHCPS:Recv DISCOVER from 44:65:0D:69:15:34
    Nov 6 22:33:17 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.105
    Nov 6 22:33:20 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:33:20 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:33:20 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:33:36 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:33:36 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:33:36 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:33:43 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:33:43 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:33:43 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:34:01 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:34:01 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:34:01 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:34:06 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:34:06 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:34:06 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:34:31 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:34:31 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:34:31 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:34:36 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:34:36 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:34:36 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:35:01 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:35:01 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:35:01 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:35:08 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:35:08 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:35:08 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:35:33 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:35:33 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:35:33 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:35:38 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:35:38 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:35:38 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:35:54 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:35:54 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:35:54 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:36:03 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:36:03 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:36:03 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:36:22 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:36:22 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:36:22 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:36:24 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:36:24 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:36:24 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:36:39 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:36:39 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:36:40 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:36:40 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:36:42 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:36:42 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:36:52 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:36:52 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:36:52 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:36:54 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:36:54 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:36:54 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:37:22 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:37:22 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:37:22 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:37:26 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:37:26 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:37:26 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:37:54 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:37:54 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:37:54 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:37:56 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:37:56 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:37:56 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:38:13 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:38:13 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:38:13 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:38:24 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:38:24 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:38:24 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:38:41 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:38:41 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:38:41 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:38:43 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:38:43 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:38:43 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:39:11 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:39:11 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:39:11 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:39:13 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:39:13 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:39:13 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:39:26 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:39:26 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:39:28 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:39:28 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:39:30 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:39:30 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:39:34 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:39:34 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:39:41 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:39:41 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:39:41 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:39:42 DHCP INFO DHCPS:Recv DISCOVER from BC:3B:AF:E5:B7:F8
    Nov 6 22:39:42 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.104
    Nov 6 22:39:45 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:39:45 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:39:45 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:40:13 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:40:13 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:40:13 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:40:15 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:40:15 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:40:15 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:40:31 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:40:31 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:40:31 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:40:43 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:40:43 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:40:43 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100
    Nov 6 22:40:56 DHCP INFO DHCPS:Recv REQUEST from 94:53:30:39:6D:EE
    Nov 6 22:40:56 DHCP INFO DHCPS:Send ACK to 192.168.0.103
    Nov 6 22:41:01 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:A6:61
    Nov 6 22:41:01 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:41:01 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.101
    Nov 6 22:41:01 DHCP INFO DHCPS:Recv DISCOVER from 28:F3:66:F3:FB:23
    Nov 6 22:41:01 DHCP WARNING DHCPS:lease host name not found
    Nov 6 22:41:01 DHCP INFO DHCPS:Send OFFER with ip 192.168.0.100

  2. #2
    No much valuable information in the log.
    Have a try to change the channel and channel width.
    Use inssider to find the best channel which is less interfered and change the channel width to 20Mhz.

  3. #3
    Junior Member cptnformat is on a distinguished road
    Join Date
    Nov 2017
    Posts
    2
    Hi - I am experiencing the same issues - the 2.4GHz network on my Archer C7 V2 will suddenly stop working. The events in my system log are the same as your example, I only see the DHCP events.

    Setting the channel to auto, or manual doesn't make a difference. Setting the channel to values 1, 6, or 11 manually also have no affect.

    I have tried the latest versions of firmware available for my country - this also has not made an improvement.

  4. #4
    Hi,

    What's the current firmware version of your router? When the 2.4GHz stops working, will you still see the SSID of the 2.4GHz? If you can see, are you able to reconnect?

    Quote Originally Posted by cptnformat View Post
    Hi - I am experiencing the same issues - the 2.4GHz network on my Archer C7 V2 will suddenly stop working. The events in my system log are the same as your example, I only see the DHCP events.

    Setting the channel to auto, or manual doesn't make a difference. Setting the channel to values 1, 6, or 11 manually also have no affect.

    I have tried the latest versions of firmware available for my country - this also has not made an improvement.


 

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