[solved] SSHFS fails to connect after years of faithful service

Mik3e · 05-27-2021, 04:27 PM

There are two computers and they are both dual-boot with linux distros. For several years, possibly ten, sshfs was successfully used to connect them, and then, about a month ago, something went sideways.

Firewalls are disabled, and each distro has a static ip: 192.168.10.11-16.
Typical terminal command: sshfs 192.168.10.14:/media/Wren /media/Remote
Result, system hangs until it times out.
Most common debug output:
ssh: connect to host 192.168.10.1X port 22: Connection timed out
read: Connection reset by peer

Computer 1 LMDE/Cinnamon does not connect Computer 2 Mint/xfce
Computer 2 Mint/xfce connects Computer 1 LMDE/Cinnamon

Computer 1 Mint/Mate does not connect Computer 2 Mint/xfce
Computer 2 Mint/xfce does not connect Computer 1 Mint/Mate

Computer 1 Mint/Mate connected Computer 2 MX/xfce once, then failed
Debug output:
ssh: connect to host 192.168.10.14 port 22: Connection refused
read: Connection reset by peer
Computer 2 MX/xfce does not connect Computer 1 Mint/Mate

Computer 1 LMDE/Cinnamon does not connect Computer 2 MX/xfce
Computer 2 MX/xfce connects Computer 1 LMDE/Cinnamon

syslogs show:
May 27 12:08:38 Magpie systemd[1]: media-Remote.mount: Succeeded.
May 27 12:08:38 Magpie systemd[906]: media-Remote.mount: Succeeded.

Have tried to no effect:
ssh-keygen -f "/home/mike/.ssh/known_hosts" -R "192.168.10.1X"

Have purged and reinstalled ssh and sshfs in Mint/Mate.
Have tried ssh:// ... in Caja and Nemo to no effect, host could not be found.
Have pinged successfully in several directions.
Samba is installed in MX only, and certainly not setup. Some Samba support files are installed as part of the default installations.

Computer 1:

Code:

LMDE cinnamon
2021-05-11
LMDE 4 (debbie)

--inxi -v7 -Z -c0--
System:
  Host: raven Kernel: 4.19.0-16-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 
  Desktop: Cinnamon 4.8.6 wm: muffin 4.8.1 dm: LightDM 1.26.0 
  Distro: LMDE 4 Debbie base: Debian 10.2 buster 
Machine:
  Type: Desktop System: Gigabyte Tecohnology product: H61M-DS2 v: N/A 
  serial: <root required> Chassis: type: 3 serial: <root required> 
  Mobo: INTEL model: H61M-DS2 v: x.x serial: <root required> 
  BIOS: American Megatrends v: F4 date: 12/21/2011 
Battery:
  Device-1: hidpp_battery_0 model: Logitech Wireless Mouse M325 
  serial: 400a-bb-e2-16-ce charge: 55% (should be ignored) rechargeable: yes 
  status: Discharging 
Memory:
  RAM: total: 3.75 GiB used: 802.0 MiB (20.9%) 
  RAM Report: 
  permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Topology: Dual Core model: Intel Pentium G630 bits: 64 type: MCP 
  arch: Sandy Bridge rev: 7 L2 cache: 3072 KiB bogomips: 10775 
  Speed: 1597 MHz min/max: 1600/2700 MHz Core speeds (MHz): 1: 1596 2: 1596 
  Flags: acpi aperfmperf apic arat arch_perfmon bts clflush cmov 
  constant_tsc cpuid cx16 cx8 de ds_cpl dtes64 dtherm dts epb ept est 
  flexpriority flush_l1d fpu fxsr ht ibpb ibrs lahf_lm lm mca mce md_clear 
  mmx monitor msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm 
  pebs pge pln pni popcnt pse pse36 pti pts rdtscp rep_good sep ss ssbd sse 
  sse2 sse4_1 sse4_2 ssse3 stibp syscall tm tm2 tpr_shadow tsc 
  tsc_deadline_timer vme vmx vnmi vpid xsave xsaveopt xtopology xtpr 
Graphics:
  Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics 
  vendor: Gigabyte driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:0102 
  Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: Mesa DRI Intel Sandybridge Desktop v: 3.3 Mesa 18.3.6 
  compat-v: 3.0 direct render: Yes 
Audio:
  Device-1: Intel 6 Series/C200 Series Family High Definition Audio 
  vendor: Gigabyte driver: snd_hda_intel v: kernel bus ID: 00:1b.0 
  chip ID: 8086:1c20 
  Sound Server: ALSA v: k4.19.0-16-amd64 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Gigabyte driver: r8169 v: kernel port: e000 bus ID: 02:00.0 
  chip ID: 10ec:8168 
  IF: enp2s0 state: up speed: 100 Mbps duplex: full mac: 50:e5:e5:e5:e5:2a 
  IP v4: 192.168.10.15/24 type: noprefixroute scope: global 
  broadcast: 192.168.10.255 
  IP v6: fe80::d12f:d12f:d12f:f205/64 type: noprefixroute scope: link 
  WAN IP: 67.40.201.25 
Drives:
  Local Storage: total: 931.52 GiB used: 198.52 GiB (21.3%) 
  ID-1: /dev/sda vendor: Samsung model: SSD 840 EVO 500GB size: 465.76 GiB 
  speed: 3.0 Gb/s serial: S1DHNSBF640724R rev: BB6Q scheme: MBR 
  ID-2: /dev/sdb vendor: Western Digital model: WD5000AAKX-001CA0 
  size: 465.76 GiB speed: 3.0 Gb/s serial: WD-WMAYUR501313 rev: 1H15 
  scheme: MBR 
  Optical-1: /dev/sr0 vendor: ATAPI model: iHAS324 B rev: AL1B 
  dev-links: cdrom,cdrw,dvd,dvdrw 
  Features: speed: 48 multisession: yes audio: yes dvd: yes 
  rw: cd-r,cd-rw,dvd-r,dvd-ram state: running 
RAID:
  Message: No RAID data was found. 
Partition:
  ID-1: / size: 19.10 GiB used: 6.02 GiB (31.5%) fs: ext4 dev: /dev/sda3 
  label: Raven uuid: 6bd87bde-9d5a-4dd6-9c3b-1f09f2013421 
  ID-2: /home size: 9.55 GiB used: 2.04 GiB (21.4%) fs: ext4 dev: /dev/sda7 
  label: Curlew uuid: 29296fce-9769-491a-93f7-a3c30db72001 
  ID-3: /media/Avocet size: 454.49 GiB used: 190.47 GiB (41.9%) fs: ext4 
  dev: /dev/sdb1 label: Avocet uuid: deae274d-0ebd-41e2-9229-2215400caa8b 
  ID-4: swap-1 size: 3.90 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sdb5 
  label: N/A uuid: 7f0c5891-593f-4169-a5c0-189a4434f2e7 
Unmounted:
  ID-1: /dev/sda1 size: 19.53 GiB fs: ext4 label: Magpie 
  uuid: 709106a0-94e6-40c5-9c66-42b6ede6fab1 
  ID-2: /dev/sda2 size: 19.53 GiB fs: ext4 label: Shrike 
  uuid: a5aa87fc-2a72-45a6-adf6-d4f9d16a9579 
  ID-3: /dev/sda4 size: 1 KiB fs: <root required> label: N/A uuid: N/A 
  ID-4: /dev/sda5 size: 9.77 GiB fs: ext4 label: Whimbrel 
  uuid: 19ddc2ff-0c90-4e70-8415-da36474a7322 
  ID-5: /dev/sda6 size: 9.77 GiB fs: ext4 label: Godwit 
  uuid: f2a68d32-fc98-4907-bdf0-ddda7d9c385f 
  ID-6: /dev/sda8 size: 377.87 GiB fs: ext4 label: Sandhill 
  uuid: 3c8682b1-06a6-46d3-8b38-fcec6c3d2195 
  ID-7: /dev/sdb2 size: 1 KiB fs: <root required> label: N/A uuid: N/A 
USB:
  Hub: 1-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Hub: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip ID: 8087:0024 
  Hub: 2-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Hub: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip ID: 8087:0024 
  Device-1: 2-1.1:3 info: Logitech Unifying Receiver 
  type: Keyboard,Mouse,HID driver: logitech-djreceiver,usbhid interfaces: 3 
  rev: 2.0 speed: 12 Mb/s chip ID: 046d:c52b 
  Device-2: 2-1.5:4 info: HP DeskJet 930c type: Printer driver: usblp 
  interfaces: 1 rev: 1.0 speed: 12 Mb/s chip ID: 03f0:1204 
  serial: MX07J1S00XJJ 
  Device-3: 2-1.6:5 info: Chicony type: Keyboard driver: hid-generic,usbhid 
  interfaces: 1 rev: 2.0 speed: 1.5 Mb/s chip ID: 04f2:0400 
Sensors:
  System Temperatures: cpu: 32.0 C mobo: N/A 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 166 Uptime: 22m Init: systemd v: 241 runlevel: 5 Compilers: 
  gcc: 8.3.0 alt: 8 Shell: sysdata.scr running in: gnome-terminal 
  inxi: 3.0.32 

--wmctrl -m--
Name: Mutter (Muffin)

--XDG_SESSION_TYPE--
x11

--ip -s address--
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
    RX: bytes  packets  errors  dropped overrun mcast   
    6798       86       0       0       0       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    6798       86       0       0       0       0       
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 50:e5:e5:e5:e5:2a brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.15/24 brd 192.168.10.255 scope global noprefixroute enp2s0
       valid_lft forever preferred_lft forever
    inet6 fe80::d12f:d12f:d12f:f205/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
    RX: bytes  packets  errors  dropped overrun mcast   
    7370       81       0       0       0       5       
    TX: bytes  packets  errors  dropped carrier collsns 
    15098      151      0       0       0       0       

--ip route--
default via 192.168.10.1 dev enp2s0 proto static metric 100 
169.254.0.0/16 dev enp2s0 scope link metric 1000 
192.168.10.0/24 dev enp2s0 proto kernel scope link src 192.168.10.15 metric 100 

--route -n--
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.10.1    0.0.0.0         UG    100    0        0 enp2s0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 enp2s0
192.168.10.0    0.0.0.0         255.255.255.0   U     100    0        0 enp2s0

--inxi -rc0--
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://muug.ca/mirror/linuxmint/packages debbie main upstream import backport
  2: deb http://mirrors.ocf.berkeley.edu/debian/ buster main contrib non-free
  3: deb http://mirrors.ocf.berkeley.edu/debian/ buster-updates main contrib non-free
  4: deb http://security.debian.org/ buster/updates main contrib non-free
  5: deb http://mirrors.ocf.berkeley.edu/debian/ buster-backports main contrib non-free

--versions--
GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)
BleachBit version 2.0
conky 1.10.8 
Diodon 1.8.0
fdisk from util-linux 2.33.1
FeatherNotes 0.4.6
Mozilla Firefox 78.10.1esr
GNU Image Manipulation Program version 2.10.8
# GNOME Terminal 3.30.2 using VTE 0.54.2 +GNUTLS
GnuCash 3.4
grep (GNU grep) 3.3
Inkscape 0.92.4 (5da689c313, 2019-01-14)
inxi 3.0.32-00 (2019-02-07)
keepassxc 2.3.4
LibreOffice 6.1.5.2 10(Build:2)
logrotate 3.14.0
mintupdate 5.7.3
pkexec version 0.105
Python 3.7.3
Quod Libet 4.2.1
sed (GNU sed) 4.7
SSHFS version 2.10.0
Sudo version 1.8.27
Thunderbird 78.10.0
xed - Version 2.8.4
Xpad 5.3
yad 0.40.0 (GTK+ 3.24.5)

--sensors--
acpitz-acpi-0
Adapter: ACPI interface
temp1:        +27.8°C  (crit = +96.0°C)
temp2:        +29.8°C  (crit = +96.0°C)

Computer 2

Code:

MX lightdm-xsession
2021-05-27
mike

--inxi -v7 -Z -c0--
System:
  Host: Dipper Kernel: 4.19.0-16-amd64 x86_64 bits: 64 compiler: gcc 
  v: 8.3.0 Desktop: Xfce 4.14.2 tk: Gtk 3.24.5 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.26.0 Distro: MX-19.4_x64 patito feo November 11  2020 
  base: Debian GNU/Linux 10 (buster) 
Machine:
  Type: Desktop Mobo: EVGA model: 111-CD-E630 v: Rev 1.xx 
  serial: <root required> BIOS: American Megatrends v: 0301 date: 01/20/2010 
Battery:
  Device-1: hidpp_battery_0 model: Logitech Wireless Mouse M325 
  serial: 400a-2b-56-14-89 charge: 55% (should be ignored) rechargeable: yes 
  status: Discharging 
Memory:
  RAM: total: 3.60 GiB used: 378.3 MiB (10.3%) 
  RAM Report: 
  permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Topology: Dual Core model: Intel Core i3 530 bits: 64 type: MT MCP 
  arch: Nehalem rev: 2 L2 cache: 4096 KiB bogomips: 23407 
  Speed: 1462 MHz min/max: 1200/2933 MHz Core speeds (MHz): 1: 1463 2: 1463 
  3: 1463 4: 1464 
  Flags: acpi aperfmperf apic arat arch_perfmon bts clflush cmov 
  constant_tsc cpuid cx16 cx8 de ds_cpl dtes64 dtherm dts ept est 
  flexpriority flush_l1d fpu fxsr ht ibpb ibrs lahf_lm lm mca mce mmx 
  monitor msr mtrr nonstop_tsc nopl nx pae pat pbe pdcm pebs pge pni popcnt 
  pse pse36 pti rdtscp rep_good sep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 
  stibp syscall tm tm2 tpr_shadow tsc vme vmx vnmi vpid xtopology xtpr 
Graphics:
  Device-1: Intel Core Processor Integrated Graphics vendor: Pegatron 
  driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:0042 
  Display: x11 server: X.Org 1.20.4 driver: intel resolution: 1680x1050~60Hz 
  OpenGL: renderer: Mesa DRI Intel Ironlake Desktop v: 2.1 Mesa 18.3.6 
  direct render: Yes 
Audio:
  Device-1: Intel 5 Series/3400 Series High Definition Audio 
  vendor: Pegatron driver: snd_hda_intel v: kernel bus ID: 00:1b.0 
  chip ID: 8086:3b56 
  Sound Server: ALSA v: k4.19.0-16-amd64 
Network:
  Device-1: Intel 82578DC Gigabit Network vendor: Pegatron driver: e1000e 
  v: 3.2.6-k port: e880 bus ID: 00:19.0 chip ID: 8086:10f0 
  IF: eth0 state: up speed: 100 Mbps duplex: full mac: e0:cb:cb:cb:cb:d5 
  IP v4: 192.168.10.14/24 type: noprefixroute scope: global 
  broadcast: 192.168.10.255 
  IP v6: fe80::cb:cb:cb:d59c/64 type: noprefixroute scope: link 
  WAN IP: 67.42.94.176 
Drives:
  Local Storage: total: 465.76 GiB used: 183.70 GiB (39.4%) 
  ID-1: /dev/sda vendor: Western Digital model: WD5000AAKX-00ERMA0 
  size: 465.76 GiB speed: 3.0 Gb/s rotation: 7200 rpm 
  serial: WD-WCC2EUD14009 rev: 1H15 scheme: MBR 
  Optical-1: /dev/sr0 vendor: ATAPI model: iHAS324 Y rev: BL1W 
  dev-links: cdrom,cdrw,dvd,dvdrw 
  Features: speed: 48 multisession: yes audio: yes dvd: yes 
  rw: cd-r,cd-rw,dvd-r,dvd-ram state: running 
RAID:
  Message: No RAID data was found. 
Partition:
  ID-1: / size: 19.10 GiB used: 6.00 GiB (31.4%) fs: ext4 dev: /dev/sda4 
  label: Nuthatch uuid: 8228a13c-4522-4e4c-8b69-857a5f3e6f90 
  ID-2: /home size: 9.55 GiB used: 257.8 MiB (2.6%) fs: ext4 dev: /dev/sda7 
  label: Verdin uuid: 37c6a987-a5b4-40db-ad5a-c915e16eea8e 
  ID-3: /media/Wren size: 367.23 GiB used: 177.46 GiB (48.3%) fs: ext4 
  dev: /dev/sda8 label: Wren uuid: 53fdcead-952b-4f13-a011-98fe972019cb 
  ID-4: swap-1 size: 4.66 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda5 
  label: N/A uuid: e5b4a468-659f-4bce-b498-c86417dc7532 
Unmounted:
  ID-1: /dev/sda1 size: 19.53 GiB fs: ext4 label: Dipper 
  uuid: bfee624a-201c-4bf2-a751-598598690883 
  ID-2: /dev/sda2 size: 1 KiB fs: <root required> label: N/A uuid: N/A 
  ID-3: /dev/sda3 size: 19.53 GiB fs: ext4 label: Waxwing 
  uuid: 6dec0995-1537-4468-9040-639ddf24d48d 
  ID-4: /dev/sda6 size: 9.77 GiB fs: ext4 label: Crossbill 
  uuid: 1d931830-f00d-4573-b21c-064d1cb96548 
  ID-5: /dev/sda9 size: 9.76 GiB fs: ext4 label: Auklet 
  uuid: 4f6529a8-10eb-4642-9d1b-53b1c448fb4b 
USB:
  Hub: 1-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Hub: 2-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Hub: 3-0:1 info: Full speed (or root) Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Device-1: 3-4:2 info: Genesys Logic USB 2.0 Multislot Card Reader/Writer 
  type: Mass Storage driver: usb-storage interfaces: 1 rev: 2.0 
  speed: 480 Mb/s chip ID: 05e3:0716 serial: 000000009744 
  Hub: 4-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Hub: 5-0:1 info: Full speed (or root) Hub ports: 8 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Hub: 6-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Hub: 7-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Hub: 8-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 speed: 12 Mb/s 
  chip ID: 1d6b:0001 
  Device-2: 8-2:2 info: Logitech Unifying Receiver type: Keyboard,Mouse,HID 
  driver: logitech-djreceiver,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s 
  chip ID: 046d:c52b 
Sensors:
  System Temperatures: cpu: 27.0 C mobo: N/A 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 189 Uptime: 1m Init: SysVinit v: 2.93 runlevel: 5 default: 5 
  Compilers: gcc: 8.3.0 alt: 8 Shell: sysdata.scr running in: gnome-terminal 
  inxi: 3.0.36 

--wmctrl -m--
Name: Xfwm4

--ip -s address--
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
    RX: bytes  packets  errors  dropped overrun mcast   
    1514       20       0       0       0       0       
    TX: bytes  packets  errors  dropped carrier collsns 
    1514       20       0       0       0       0       
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether e0:cb:cb:cb:cb:d5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.14/24 brd 192.168.10.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::cb:cb:cb:d59c/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
    RX: bytes  packets  errors  dropped overrun mcast   
    6788       59       0       0       0       13      
    TX: bytes  packets  errors  dropped carrier collsns 
    10457      88       0       0       0       0       

--ip route--
default via 192.168.10.1 dev eth0 proto static metric 100 
192.168.10.0/24 dev eth0 proto kernel scope link src 192.168.10.14 metric 100 

--route -n--

--inxi -rc0--
Repos:
  No active apt repos in: /etc/apt/sources.list 
  Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list 
  1: deb http://deb.debian.org/debian buster-updates main contrib non-free
  Active apt repos in: /etc/apt/sources.list.d/debian.list 
  1: deb http://deb.debian.org/debian buster main contrib non-free
  2: deb http://deb.debian.org/debian-security buster/updates main contrib non-free
  Active apt repos in: /etc/apt/sources.list.d/mx.list 
  1: deb http://la.mxrepo.com/mx/repo/ buster main non-free
  No active apt repos in: /etc/apt/sources.list.d/various.list 

--versions--
GNU bash, version 5.0.3(1)-release (x86_64-pc-linux-gnu)
BleachBit version 4.1.0
conky 1.10.8 
fdisk from util-linux 2.33.1
FeatherNotes 0.7.0
Mozilla Firefox 88.0.1
GNU Image Manipulation Program version 2.10.12
# GNOME Terminal 3.30.2 using VTE 0.54.2 +GNUTLS
grep (GNU grep) 3.3
inxi 3.0.36-00 (2019-08-14)
LibreOffice 6.1.5.2 10(Build:2)
logrotate 3.14.0
pkexec version 0.105
Python 3.7.3
Quod Libet 4.2.1
sed (GNU sed) 4.7
SSHFS version 2.10.0
Sudo version 1.8.27
thunar 1.8.14 (Xfce 4.14)
Thunderbird 68.12.0
yad 0.40.0 (GTK+ 3.24.5)

--sensors--
coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +28.0°C  (high = +89.0°C, crit = +105.0°C)
Core 2:       +32.0°C  (high = +89.0°C, crit = +105.0°C)

Where to turn?
Mike

michaelk · 05-27-2021, 05:20 PM

Is ssh running on both computers and what port is it listening to?
Check with netstat

Can you ssh on the same computer to itself? ssh localhost

Mik3e · 05-27-2021, 07:35 PM

ssh is installed but not running until sshfs launches it. pids for sshfs and ssh are killed when the connection times out. netstat does not show ssh on Computer 1 Mint/Mate until sshfs runs, the line is: tcp 0 1 Magpie:51666 192.168.10.14:ssh SYN_SENT. 192.168.10.14 is correct for Computer 2 MX/xfce, which was running.

ssh localhost creates localhost:ssh, which shows in netstat.

Same results with Computer 2 Mint/xfce. MX doesn't have netstat, but otherwise the same result on Computer 2 MX/xfce.

Mike

michaelk · 05-27-2021, 08:15 PM

sshfs is a fuse filesystem that uses sftp as the underlying protocol and sftp is a subsystem of ssh. For computer 1 to connect to computer 2 ssh has to running on computer 2. If you can login on computer 2 using ssh i.e. ssh localhost that would confirm ssh is working. If you can login on computer 2 ssh computer-2-ip_address on computer 2 then most likely the problem is with computer 1 assuming the firewalls are really disabled.

Is ssh actually listening to port 22

ondoho · 05-27-2021, 10:37 PM

Quote:

Originally Posted by michaelk

For computer 1 to connect to computer 2 ssh has to running on computer 2.

Correction: sshd has to be running on computer 2 (and you use the ssh utility on computer 1 to connect to it).

So:

the connection is unidirectional: 1 uses ssh to connect to 2, which runs the sshd daemon (and I'm pretty sure it cannot be started on demand)
if you want bidirectional, I guess that would be possible if you implement the above in opposite directions, but usually that's not necessary

I found it difficult to separate relevant from irrelevant information in post #1, and I suspect the relevant info was incomplete.
I would like to ascertain in which direction the connection is supposed to go.
Then I would like to ascertain that ssh is actually working in that direction (something in post #1 seems to point to the culprit being ssh itself, not sshfs).

Mik3e · 05-27-2021, 10:46 PM

I'm on the verge of solving this, but I'll respond to your comments first. I have been able to login on both computers with both ssh localhost and ssh local-ip-address. And, every indication is that ssh is listening to port 22.

And then, you wrote "assuming the firewalls are really disabled". I assumed that too because I know that's an issue and I specifically disabled firewalls in each dist. Nevertheless, I checked it again and the firewalls were back on both computers. As you can imagine I was disgusted, I still am.

When I get back to this tomorrow I'll check the firewalls again to see if they are back. Then I'll drive a stake in their black hearts.

Thanks for your help, with any luck this is over, I'll let you know.
Mike

Mik3e · 05-27-2021, 10:57 PM

That explains why I've seen sshd listed in 'top'.

I understand that the connection is unidirectional. In the process of trying to isolate the issue I tried the connection in one direction and then the other. And, I'm sure that relevant info is missing. If I knew what was relevant I'd be in better shape from the start.

Mike

ondoho · 05-27-2021, 11:14 PM

^ As I wrote, let's ascertain that ssh is working in the desired direction.

Assuming the target machine (computer 2 in my previous post) is called "server", and the user "user", issue the following on computer 1, and show us:

Code:

ssh -vvv user@server

Turbocapitalist · 05-28-2021, 12:24 AM

Quote:

Originally Posted by ondoho

Code:

ssh -vvv user@server

Also, in the SSHFS client, the LogLevel (-v) option for the SSH client can be passed to SSH / SFTP via SSHFS via the -o option, or the FUSE debugging can be activated with -d:

Code:

sshfs -d 192.168.10.14:/media/Wren /media/Remote
sshfs -o "debug" 192.168.10.14:/media/Wren /media/Remote

sshfs -o "debug,LogLevel=DEBUG1" 192.168.10.14:/media/Wren /media/Remote

Mik3e · 05-28-2021, 07:16 PM

The root issue was that the Mint distros were configured to enable ufw at boot, and ufw then became active. When I had stopped ufw I had not actually disabled it, that takes 'sudo systemctl disable ufw'. Now 'sudo systemctl status ufw' shows the status is 'inactive (dead)', and it doesn't change on boot.

That doesn't explain why ufw stayed out of the way for years and seemingly spontaneously became active. My only guess is the major upgrade released just after the first of the year, which I applied in March.

Thanks again for your help,
Mike

michaelk · 05-28-2021, 07:27 PM

You can mark the thread as solved using the thread tools pull down menu at the top of the page.