Strange internet connection behavior

I am experiencing strange behavior with my internet connection. Overall, it's erratic. E.g., when I boot the system, the internet connection fails. Yet, after it does so, I am able to run my browser, load web pages, access streaming media -- all while right-clicking on the internet connection button on the menu bar shows no connection in effect.
However, for the most part I am unable to to download my email -- though occasionally that works, too.
Finally, I am never able to initiate an internet connection. E.g., if I right-click on the connection button in the menu bar and click on "Connection PPPoE," the system eventually informs me that it "could not find a PPPoE server."
Throughout, my DSL modem shows that I am connected.
Any help would be greatly appreciated.
Sincerely,
Eric Weir

The MacBook is connected directly to a DSL modem. No router.
I checked and reset my account settings, although they were as you recommend before I did so. I also reset the modem -- disconnected power for about 30 seconds, then held the reset button in for about 10 seconds after reconnecting the power cable.
After doing that the system attempted to connect and reported it couldn't find a PPPoE server. After getting that report, however, I was able to load web pages and download my mail.
Checking network settings through system preferences with the situation as above shows that I have an ethernet connection but not a PPPoE connection. However, if, with the window for the latter selected, I click on "help me" and then "diagnostics," the system reports that the internet connection is working properly.
Bottom line at this point? I can load web pages and download email, but the menu bar indicates no connection. Paralleling that, the system says I have no PPPoE connection, but diagnostics says the internet connection is working properly.
Five minutes from now I may or may not be able to download email. I probably will be able to load web pages.
An AT&T technician is scheduled to be here this afternoon. This strikes me as an operating system problem, however, not a problem with my ISP.
Again, additional clues would be appreciated.
Sincerely,
Eric Weir

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    proc-sys-fs-binfmt_misc.automount                                                           loaded active waiting       Arbitrary Executable File Formats File System Automount Point
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    sys-devices-platform-thinkpad_acpi-sound-card29.device                                      loaded active plugged       /sys/devices/platform/thinkpad_acpi/sound/card29
    sys-module-fuse.device                                                                      loaded active plugged       /sys/module/fuse
    sys-subsystem-bluetooth-devices-hci0.device                                                 loaded active plugged       /sys/subsystem/bluetooth/devices/hci0
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    dev-hugepages.mount                                                                         loaded active mounted       Huge Pages File System
    dev-mqueue.mount                                                                            loaded active mounted       POSIX Message Queue File System
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    sys-kernel-debug.mount                                                                      loaded active mounted       Debug File System
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    systemd-ask-password-wall.path                                                              loaded active waiting       Forward Password Requests to Wall Directory Watch
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    cronie.service                                                                              loaded active running       Periodic Command Scheduler
    cups.service                                                                                loaded active running       CUPS Printing Service
    dbus.service                                                                                loaded active running       D-Bus System Message Bus
    [email protected]                                                                          loaded active running       Getty on tty1
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    slim.service                                                                                loaded active running       SLiM Simple Login Manager
    sshd.service                                                                                loaded active running       OpenSSH Daemon
    syslog-ng.service                                                                           loaded active running       System Logger Daemon
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    systemd-logind.service                                                                      loaded active running       Login Service
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    systemd-user-sessions.service                                                               loaded active exited        Permit User Sessions
    systemd-vconsole-setup.service                                                              loaded active exited        Setup Virtual Console
    udisks2.service                                                                             loaded active running       Disk Manager
    upower.service                                                                              loaded active running       Daemon for power management
    cups.socket                                                                                 loaded active listening     CUPS Printing Service Sockets
    dbus.socket                                                                                 loaded active running       D-Bus System Message Bus Socket
    syslog.socket                                                                               loaded active running       Syslog Socket
    systemd-initctl.socket                                                                      loaded active listening     /dev/initctl Compatibility Named Pipe
    systemd-journald.socket                                                                     loaded active running       Journal Socket
    systemd-shutdownd.socket                                                                    loaded active listening     Delayed Shutdown Socket
    systemd-udevd-control.socket                                                                loaded active listening     udev Control Socket
    systemd-udevd-kernel.socket                                                                 loaded active running       udev Kernel Socket
    dev-sda5.swap                                                                               loaded active active        /dev/sda5
    basic.target                                                                                loaded active active        Basic System
    bluetooth.target                                                                            loaded active active        Bluetooth
    cryptsetup.target                                                                           loaded active active        Encrypted Volumes
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    graphical.target                                                                            loaded active active        Graphical Interface
    local-fs-pre.target                                                                         loaded active active        Local File Systems (Pre)
    local-fs.target                                                                             loaded active active        Local File Systems
    multi-user.target                                                                           loaded active active        Multi-User
    network.target                                                                              loaded active active        Network
    remote-fs.target                                                                            loaded active active        Remote File Systems
    sockets.target                                                                              loaded active active        Sockets
    sound.target                                                                                loaded active active        Sound Card
    swap.target                                                                                 loaded active active        Swap
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    syslog.target                                                                               loaded active active        Syslog
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    DEBUG: Loading profile GroundWork
    DEBUG: Configuring interface wlan0
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    DEBUG: Loading profile GroundWork
    DEBUG: Configuring interface wlan0
    DEBUG: wireless_up start_wpa wlan0 /run/network/wpa.wlan0/wpa.conf nl80211,wext
    DEBUG: wireless_up scanning
    DEBUG: wpa_cli -i wlan0 -p /run/wpa_supplicant scan
    DEBUG: wpa_cli -i wlan0 -p /run/wpa_supplicant scan_results
    DEBUG: wpa_find_essid "GroundWork"
    DEBUG: wireless_up Configuration generated at /run/network/wpa.wlan0/wpa.conf
    DEBUG: wireless_up wpa_reconfigure wlan0
    DEBUG: wpa_cli -i wlan0 -p /run/wpa_supplicant reconfigure
    DEBUG: wireless_up ifup
    DEBUG: wireless_up wpa_check
    DEBUG: Loading profile GroundWork
    DEBUG: Configuring interface wlan0
    DEBUG: ethernet_up bring_interface up wlan0
    DEBUG: ethernet_up dhcpcd -qL -t 10 wlan0
    DEBUG:
    DEBUG: ethernet_up hostname okosmos
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    [root@okosmos ~]# id root
    uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),19(log)
    [root@okosmos ~]# id ambantis
    uid=1000(ambantis) gid=100(users) groups=100(users)
    and $ systemctl
    UNIT LOAD ACTIVE SUB JOB DESCRIPTION
    proc-sys-fs-binfmt_misc.automount loaded active waiting Arbitrary Executable File Formats File System Automount Point
    sys-devices-pci0000:00-0000:00:16.3-tty-ttyS0.device loaded active plugged 5 Series/3400 Series Chipset KT Controller
    sys-devices-pci0000:00-0000:00:19.0-net-eth0.device loaded active plugged 82577LM Gigabit Network Connection
    sys-devices-pci0000:00-0000:00:1a.0-usb1-1\x2d1-1\x2d1.4-1\x2d1.4:1.0-bluetooth-hci0.device loaded active plugged /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/bluetooth/hci0
    sys-devices-pci0000:00-0000:00:1b.0-sound-card0.device loaded active plugged 5 Series/3400 Series Chipset High Definition Audio
    sys-devices-pci0000:00-0000:00:1c.1-0000:03:00.0-net-wlan0.device loaded active plugged RTL8191SEvB Wireless LAN Controller
    sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda1.device loaded active plugged ST9500420AS
    sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda2.device loaded active plugged ST9500420AS
    sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda3.device loaded active plugged ST9500420AS
    sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda4.device loaded active plugged ST9500420AS
    sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda5.device loaded active plugged ST9500420AS
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    sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:0-1:0:0:0-block-sr0.device loaded active plugged HL-DT-ST_DVDRAM_GU40N
    sys-devices-platform-serial8250-tty-ttyS1.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS1
    sys-devices-platform-serial8250-tty-ttyS2.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS2
    sys-devices-platform-serial8250-tty-ttyS3.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS3
    sys-devices-platform-thinkpad_acpi-sound-card29.device loaded active plugged /sys/devices/platform/thinkpad_acpi/sound/card29
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    sys-subsystem-net-devices-eth0.device loaded active plugged 82577LM Gigabit Network Connection
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    -.mount loaded active mounted /
    boot.mount loaded active mounted /boot
    dev-hugepages.mount loaded active mounted Huge Pages File System
    dev-mqueue.mount loaded active mounted POSIX Message Queue File System
    home.mount loaded active mounted /home
    run-user-1000-gvfs.mount loaded active mounted /run/user/1000/gvfs
    sys-fs-fuse-connections.mount loaded active mounted FUSE Control File System
    sys-kernel-debug.mount loaded active mounted Debug File System
    tmp.mount loaded active mounted /tmp
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    systemd-ask-password-wall.path loaded active waiting Forward Password Requests to Wall Directory Watch
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    dbus.service loaded active running D-Bus System Message Bus
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    netcfg.service loaded active exited Netcfg multi-profile daemon
    ntpd.service loaded failed failed Network Time Service
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    sshd.service loaded active running OpenSSH Daemon
    syslog-ng.service loaded active running System Logger Daemon
    systemd-journald.service loaded active running Journal Service
    systemd-logind.service loaded active running Login Service
    systemd-modules-load.service loaded active exited Load Kernel Modules
    systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
    systemd-sysctl.service loaded active exited Apply Kernel Variables
    systemd-tmpfiles-setup.service loaded active exited Recreate Volatile Files and Directories
    systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
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    systemd-user-sessions.service loaded active exited Permit User Sessions
    systemd-vconsole-setup.service loaded active exited Setup Virtual Console
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    dbus.socket loaded active running D-Bus System Message Bus Socket
    syslog.socket loaded active running Syslog Socket
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    Evadfa, welcome to the forum.
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    Please click the "Thumbs up + button" if I have helped you and click "Accept as Solution" if your problem is solved.
    Signature:
    HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
    HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
    HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
    HP Photosmart 7520 AIO
    ++++++++++++++++++
    **Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
    Intelligence is God given; Wisdom is the sum of our mistakes!
    I am not an HP employee.

  • Strange Internet connection

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    Hello again:
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    Well, in the closing the stable door approach it is a good idea to do a complete erase and install when selling any computer. There's lots of references to this and even one about removing a certain file so when they start up they get the brand new Mac greeting window. If you do not erase the drive using the secure erase feature in Disk Utility then with an $80 investment plus an empty spare drive the purchaser can likely recover any files you had on the computer recently if they consider it worth the effort.
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    You have wireless gremlins.. plus voodoo..
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    http://support.apple.com/en-au/HT202663
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