Network problems

Use this information to resolve issues related to networking.

Cannot wake server using Wake on LAN

Complete the following steps until the problem is resolved:
  1. If you are using the dual-port network adapter and the server is connected to the network using Ethernet 5 connector, check the system-error log or IMM2 system event log (see Event logs), make sure:
    1. Fan 3 is running in standby mode, if Emulex dual port 10G Base-T embedded adapter is installed.

    2. The room temperature is not too high (see Specifications).

    3. The air vents are not blocked.

    4. The air baffle is installed securely.

  2. Reseat the dual-port network adapter.

  3. Turn off the server and disconnect it from the power source; then, wait 10 seconds before restarting the server.

  4. If the problem still remains, replace the dual-port network adapter.

Could not log in using LDAP account with SSL enabled

Complete the following steps until the problem is resolved:
  1. Make sure that the license key is valid.

  2. Generate a new license key and log in again.

Server could not connect to the Wi-Fi

Complete the following steps until the problem is resolved:

  1. Log into Lenovo XClarity Controller (change password for the first-time log in). Enable Wi-Fi Connectivity and input the information of the existing Wi-Fi.

    Note: Server supports WPA2 only.
    Figure 1. Network setting
    Network setting
  2. If the server still cannot connect to the Wi-Fi, repeat step one or check if WLAN module is enabled by using the command through OpenWRT:

    dmesg | grep RTW

    See example:

    oper@OpenWrt:/etc/config$ dmesg | grep RTW
    RTW: module init start
    RTW: rtl88x2be v5.2.21.5_30361.20181019
    RTW: build time: May 30 2019 04:00:44
    RTW: rtl88x2be BT-Coex version = COEX20180824-6666
    RTW: rtw_inetaddr_notifier_register
    RTW: Memory mapped space start: 0x4040000000 len:00010000 flags:00140204, after map:0xffff00000e2d0000
    RTW: CHIP TYPE: RTL8822BE
    RTW: Bus master is enabled. usPciCommand=7
    RTW: PCIe Header Offset =70
    RTW: PCIe Capability =2
    Link Control Register =40
    RTW: Clock Request =0
    

Sever could not be set as WLAN AP mode

Complete the following steps until the problem is resolved:

  1. Log into Lenovo XClarity Controller (change password for the first-time log in). Enable Wi-Fi Connectivity and input the information of AP mode.

    Note: Server supports WPA2 only.
    Figure 2. Network setting
    Network setting
  2. If the server still cannot work in AP mode, repeat step one or check the AP mode status by using the command through OpenWRT:

    sudo uci show wireless

    For example:

    oper@OpenWrt:/tmp$ sudo uci show wireless
    wireless.radio0=wifi-device
    wireless.radio0.type='mac80211'
    wireless.radio0.channel='11'
    wireless.radio0.hwmode='11n'
    wireless.radio0.path='soc/3400000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
    wireless.radio0.disabled='0'
    wireless.radio0.htmode='HT40'
    wireless.radio0.country='TW'
    wireless.default_radio0=wifi-iface
    wireless.default_radio0.device='radio0'
    wireless.default_radio0.network='wifi_lan_ap'
    wireless.default_radio0.mode='ap'
    wireless.default_radio0.ssid=' SE350_ap3'
    wireless.default_radio0.encryption='psk2'
    wireless.default_radio0.key='password'
    wireless.default_radio0.maxassoc='8'
    oper@OpenWrt:/tmp$
    

LTE connection failed

Complete the following steps until the problem is resolved:

  1. Log into Lenovo XClarity Controller (change password for the first-time log in). Enable LTE Connectivity and apply the change.

    Figure 3. Network setting
    Network setting
  2. To check if LTE module is successfully enabled, connect the server to OpenWRT via SSH (default = 192.168.70.254) and use the command below:

    oper@OpenWrt:/tmp$ sudo ifconfig

    It shows wwan0 if LTE module is successfully enabled. For example:

    oper@OpenWrt:/tmp$ sudo ifconfig 
    …
    wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
                      inet addr:10.0.148.227  P-t-P:10.0.148.227  Mask:255.255.255.248
                      inet6 addr: fe80::244a:5b3e:11a9:aee7/64 Scope:Link
                     UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
                     RX packets:110700 errors:0 dropped:0 overruns:0 frame:0
                     TX packets:45977 errors:0 dropped:0 overruns:0 carrier:0
                     collisions:0 txqueuelen:1000
                      RX bytes:160842733 (153.3 MiB)  TX bytes:2001645 (1.9 MiB)

Config LTE in Linux

Complete the following steps until the problem is resolved:

  1. QMI mode is required for LTE mode in Linux. Connect the server to OpenWRT via SSH (default = 192.168.70.254) and use the command below:

    sudo usbmode_switch_telit_openwrt.sh

For example:

oper@OpenWrt:/tmp$ sudo usbmode_switch_telit_openwrt.sh
/sys/bus/usb/devices/2-1
LN940 at MBIM mode, change to QMI mode.
oper@OpenWrt:/tmp$ sudo reboot

LTE setup checklist for Lenovo service

Complete the checklist below until the problem is resolved:

  1. Section Check item and detail

    Hardware

    LTE antennas are installed properly at correct locations.

    Antenna cable are well connected on the LTE module.

    SE350 support only 4G (LTE); 3G and 5G are not supported.

    USIM is installed properly into SIM holder of wireless adaptor card.

    Make sure to remove ac power adaptor from SE350 system before any installation or removal.

    Firmware

    XCC, UEFI and Switch board firmware are updated to the latest version.

    SIM card

    SIM Card Selection

    Use the below recommended terms while checking with your carrier.

    1. Carrier’s SIM card should support at least one of the following LTE band: 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 21, 25, 26, 28, 29, 30, 38, 39, 40, 41, 66.

    2. SIM card supports 4G (LTE).

    3. SE350 only supports USIM with Nano-SIM form factor.

    4. The SIM card can be used on Laptop or Pad with support for data transfer (no voice and SMS).

    5. In general, IOT SIM & MVNO SIM are not suitable for SE350’s LTE application, but it depends on carriers.

    Note: Verizon SIM is compatible on SE350 with switch firmware 1.03 (build version HYL408E) or above.

    SIM Card Activation

    Check the SIM card activation requirements with the carrier; then, bring the SE350 IMEI number to the carrier retail store and request for SIM activation (depends on carrier policy, some policy might not need it).

    1. Check the details with the carrier retail store.

    2. Activate the SIM card to connect to telecom services with a phone (or through SIM activation website).

    APN Setting

    Collect information from the SIM card user manual. Generally, it includes information as below, but some might have more.

    NAME, APN, PIN code, USERNAME, PASSWORD and Authentication method (CHAP or PAP).

    For example:
    • Name: SB

    • APN: plus.4g

    • Username: plus

    • Password: 4g

    • Authentication method: CHAP or PAP

    SE350 contains the most common APN settings by default. By enabling LTE into XCC_GUI or CLI WWAN, SE350 can connect to telecom services.

    The default PDP type is IPV4, this is also the most common setting. For some carriers that change the PDP type to IPV4V6 or IPV6, check the PDP type requirement with the carrier; then, change to IPV4V6 or IPV6 using the command below:

    sudo uci set network.lte_wan.pdptype='IPV4V6' 
    sudo uci commit network
    sudo /etc/init.d/network restart
    sudo at_command.sh 'at+reset'

    Log files

    For more details, see Log file

Register network with selected APN

For some special cases, it is possible to be unregistered from the telecom operator. Register again with your selected APN to the network using the command below:

AT+COPS=2  
AT+CGDCONT=1,"IPV4V6","<APN>"
AT+COPS=0  

Log file

Log files are collected by CLI commands below for SIM working status and Network Registration Status.

sudo at_command.sh 'at+cpin?'      /** Is SIM well-installed? Is PIN-CODE setting correct? **/ 
sudo at_command.sh 'AT+CIMI'      /** read IMSI **/
sudo uci show network |grep lte  /** check APN, username, password, auth, PDP type **/

Check Network Registration status:

'AT+CSQ'  /**search max RF signal quality between ‘device” and all “carriers “ around the device **/ 
'AT+COPS?' /** return wwan’s registered carrier and 4G tech if it’s successful to register to carrier **/    
'AT+CREG?'  /** report CS network registration status –2G/3G/4G **/
'AT+CEREG?' /**report EPS network registration status – 4G **/

LTE connection is unstable

The LTE signal strength might be obstructed when the SE350 is placed at the “corner of a building/department” or in a “WLAN noisy” environment.

To improve the signal strength:
  • Install the two LTE antennas in the correct positions. It is recommended to keep one antenna in a vertical position and the other in a horizontal position.
    Figure 4. Antenna position
    Antenna position
  • Move the SE350 to an area with less RF noise or a location without shields (metal parts).

Check the status with these useful commands:

ifconfig  //**check if LTE "wwan0" is ready **// 
sudo at_command.sh 'ATI‘   //**get IMEI code **//
sudo uci show network | grep lte  //** show all LTE parameters setting **// 
sudo uqmi -d /dev/cdc-wdm0 --uim-get-card-status”  //** check SIM is installed well  **// 
sudo at_command.sh 'AT+COPS?‘  //* check Carrier Network registration and configuration**//
sudo ping –I wwan0 8.8.8.8 //**check if SE350’s LTE network ping  **// 
sudo at_command.sh 'AT+CSQ‘ //**check signal strength of LTE modem **//

WLAN connection is unstable

The WLAN signal strength might be obstructed when the SE350 is placed at the “corner of a building/department” or in a “WLAN noisy” environment.

To improve the signal strength:
  • Install the two Wi-Fi antennas in the correct positions. It is recommended to keep one antenna in a vertical position and the other in a horizontal position.
    Figure 5. Antenna position
    Antenna position
  • Move the SE350 to an area with less RF noise or a location without shields (metal parts).

  • Move the SE350 closer to the WLAN AP router.

  • Adjust the Wi-Fi router’s frequency to a channel with less RF noise.

  • Adjust the direction of the router’s antennas with some positioned vertically and some positioned horizontally.

  • Wi-Fi networking performance will be affected when multiple devices are connected to the same channel at the same time. Change the frequency and channel of the Wi-Fi router, use a Wi-Fi extender to help spread out the signal, or use a router with a more powerful signal.

Check the status with these useful commands:

ifconfig  //**check if WLAN is ready, “wlan0“ shows up  **// 
sudo uci show network | grep wifi  //** show related to WLAN parameters setting **//
sudo uci show wireless //**confirm setting **//
sudo ping -I wlan0 8.8.8.8 //**check WLAN network function successfully **// 
sudo iw dev wlan0 link //**Check WLAN Signal Strength**//