Scp, ddns, ssh problem

ninjanoir78 · December 28, 2024, 8:47pm

Hi,

ok, here the problem, I found a workaround but I wonder if I can do it otherwise.

This morning I installed and configured DDNS (dynu) and now I can't using scp correctly. Scp from my local pc to OpenWrt router is ok, but scp from my router to pc, or ie; scp root@192.168.1.1:/tmp/backup-*.tar.gz james@pop-os:/media/james/E/openWrt_backup did not work.

kind of error ;

kex_exchange_identification: read: Connection reset by peer
Connection reset by 169.150.204.5 port 22 or sometimes ; port 22: Connection refused

But, it is working if I comment (#) my ddns domain line in my ubuntu config file ; /etc/resolv.conf

nameserver 127.0.0.53
options edns0 trust-ad
#search Ninjanoir78.ddnsfree.com

here my openwrt dhcp

root@james:~# cat /etc/config/dhcp

config dnsmasq
        option domainneeded '1'
        option localise_queries '1'
        option rebind_protection '0'
        option local '/lan/'
        option domain 'Ninjanoir78.ddnsfree.com'
        option expandhosts '1'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option localservice '1'
        option ednspacket_max '1232'
        option cachesize '1000'
        option port '54'
        list server '192.168.1.1'
        option serversfile '/var/run/adblock-fast/dnsmasq.servers'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '24h'
        option dhcpv4 'server'
        option force '1'
        list dhcp_option '6, 192.168.1.1'
        list dhcp_option '3, 192.168.1.1'

config dhcp 'wan'
        option interface 'wan'
        option ignore '1'

config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

So if you have a solution to keep it that working without a need to comment the domain line, or do I really need it in my ubuntu resolv.conf ?
thanks

frollic · December 28, 2024, 8:51pm

try disabling client lookups for your Ubuntu's sshd (UseDNS no), but it probably won't help.
read the Ubuntu's sshd log.

ninjanoir78 · December 28, 2024, 9:01pm

try disabling client lookups for your Ubuntu's sshd (UseDNS no).

only that does not work.

frollic · December 28, 2024, 9:02pm

check the log, you might need to enable some old encryption in sshd.

ninjanoir78 · December 28, 2024, 9:11pm

same thing on my pop-os pc (based on ubuntu)

2024-12-28T16:07:37.167295-05:00 pop-os rtkit-daemon[1363]: Supervising 6 threads of 3 processes of 1 users.
2024-12-28T16:07:37.176756-05:00 pop-os rtkit-daemon[1363]: Supervising 6 threads of 3 processes of 1 users.
2024-12-28T16:08:02.297125-05:00 pop-os cosmic-comp[2151]: Client bug: Unable to re-configure repositioned popup.
2024-12-28T16:08:29.194726-05:00 pop-os Dynu.Core.Service[1259]: Dynu.Core.Service.Worker[0] IPv4 address update not required.
2024-12-28T16:08:29.195319-05:00 pop-os Dynu.Core.Service[1259]: Dynu.Core.Service.Worker[0] IPv6 address update not required.
2024-12-28T16:08:29.195377-05:00 pop-os Dynu.Core.Service[1259]: Dynu.Core.Service.Worker[0] Current IPv4 Address: 169.150.204.52
2024-12-28T16:08:29.195432-05:00 pop-os Dynu.Core.Service[1259]: Dynu.Core.Service.Worker[0] Current IPv6 Address: Disabled
2024-12-28T16:09:04.155403-05:00 pop-os geoclue[2549]: Failed to query location: Query location SOUP error: Not Found
2024-12-28T16:09:05.966392-05:00 pop-os geoclue[2549]: Failed to query location: Query location SOUP error: Not Found
2024-12-28T16:09:20.706602-05:00 pop-os rtkit-daemon[1363]: Supervising 6 threads of 3 processes of 1 users.
2024-12-28T16:09:26.834034-05:00 pop-os rtkit-daemon[1363]: message repeated 7 times: [ Supervising 6 threads of 3 processes of 1 users.]
2024-12-28T16:09:28.149756-05:00 pop-os systemd[2074]: Started app-cosmic-com.system76.CosmicAppList-11729.scope - Application launched by COSMIC.
2024-12-28T16:09:54.856454-05:00 pop-os cosmic-comp[2151]: Client bug: Unable to re-configure repositioned popup.

as I said, everything worked just before I added my ddns

frollic · December 28, 2024, 9:13pm

I don't use Ubuntu, but is there a /var/log/secure ?

ninjanoir78 · December 28, 2024, 9:15pm

/var/log$ ls
alternatives.log  boot.log.1  bootstrap.log  dmesg.1.gz      gpu-manager.log  lastlog            syslog.2.gz
apt               boot.log.2  btmp           dmesg.2.gz      journal          openvpn            syslog.3.gz
auth.log          boot.log.3  chrony         dmesg.3.gz      kernelstub.log   private            ufw.log
auth.log.1        boot.log.4  cups           dmesg.4.gz      kern.log         README             ufw.log.1
auth.log.2.gz     boot.log.5  cups-browsed   dpkg.log        kern.log.1       speech-dispatcher  wtmp
auth.log.3.gz     boot.log.6  dmesg          faillog         kern.log.2.gz    syslog
boot.log          boot.log.7  dmesg.0        fontconfig.log  kern.log.3.gz    syslog.1

I will check if one of those would be more verbose

frollic · December 28, 2024, 9:16pm

I'd check syslog.

ninjanoir78 · December 28, 2024, 9:17pm

syslog is the one I've put here

frollic · December 28, 2024, 9:17pm

then check auth.log, like I said, I'm only guessing

ninjanoir78 · December 28, 2024, 9:18pm

btw, first time I setup ddns, I really need my domain name in my resolf.conf on my pc? It has been automatically add it there

psherman · December 28, 2024, 9:19pm

When logged into your openwrt router, can you ssh back to your pop-os device without errors:

ssh james@pop-os

frollic · December 28, 2024, 9:24pm

I assume you restarted sshd afterwards ?

ninjanoir78 · December 28, 2024, 9:25pm

does not work

ninjanoir78 · December 28, 2024, 9:32pm

debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/james/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/james/.ssh/known_hosts2'
debug2: resolving "server" port 22
debug3: resolve_host: lookup server:22
debug3: channel_clear_timeouts: clearing
debug3: ssh_connect_direct: entering
debug1: Connecting to server [169.150.204.52] port 22.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
debug1: Connection established.
debug1: identity file /home/james/.ssh/id_rsa type -1
debug1: identity file /home/james/.ssh/id_rsa-cert type -1
debug1: identity file /home/james/.ssh/id_ecdsa type -1
debug1: identity file /home/james/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/james/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/james/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/james/.ssh/id_ed25519 type 3
debug1: identity file /home/james/.ssh/id_ed25519-cert type -1
debug1: identity file /home/james/.ssh/id_ed25519_sk type -1
debug1: identity file /home/james/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/james/.ssh/id_xmss type -1
debug1: identity file /home/james/.ssh/id_xmss-cert type -1
debug1: identity file /home/james/.ssh/id_dsa type -1
debug1: identity file /home/james/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.6p1 Ubuntu-3ubuntu13.5
kex_exchange_identification: read: Connection reset by peer
Connection reset by 169.150.204.52 port 22

ninjanoir78 · December 28, 2024, 9:43pm

2024-12-28T16:29:15.031145-05:00 pop-os sudo: pam_unix(sudo:session): session opened for user root(uid=0) by james(uid=1000)
2024-12-28T16:29:15.035231-05:00 pop-os sudo: pam_unix(sudo:session): session closed for user root
2024-12-28T16:33:08.999818-05:00 pop-os sudo:    james : TTY=pts/0 ; PWD=/etc/ssh ; USER=root ; COMMAND=/usr/bin/apt-get install openssh-server
2024-12-28T16:33:09.000715-05:00 pop-os sudo: pam_unix(sudo:session): session opened for user root(uid=0) by james(uid=1000)
2024-12-28T16:33:09.709657-05:00 pop-os sudo: pam_unix(sudo:session): session closed for user root
2024-12-28T16:41:44.223162-05:00 pop-os sudo:    james : TTY=pts/0 ; PWD=/etc/ssh ; USER=root ; COMMAND=/usr/bin/systemctl status ssh
2024-12-28T16:41:44.232583-05:00 pop-os sudo: pam_unix(sudo:session): session opened for user root(uid=0) by james(uid=1000)
2024-12-28T16:42:07.160551-05:00 pop-os sudo: pam_unix(sudo:session): session closed for user root
2024-12-28T16:42:10.980626-05:00 pop-os sudo:    james : TTY=pts/0 ; PWD=/etc/ssh ; USER=root ; COMMAND=/usr/bin/systemctl restart ssh
2024-12-28T16:42:10.983914-05:00 pop-os sudo: pam_unix(sudo:session): session opened for user root(uid=0) by james(uid=1000)
2024-12-28T16:42:10.992711-05:00 pop-os sshd[9037]: Received signal 15; terminating.
2024-12-28T16:42:11.050882-05:00 pop-os sshd[13583]: Server listening on :: port 22.
2024-12-28T16:42:11.053350-05:00 pop-os sudo: pam_unix(sudo:session): session closed for user root
2024-12-28T16:42:18.116714-05:00 pop-os sudo:    james : TTY=pts/0 ; PWD=/etc/ssh ; USER=root ; COMMAND=/usr/sbin/service ssh restart
2024-12-28T16:42:18.118240-05:00 pop-os sudo: pam_unix(sudo:session): session opened for user root(uid=0) by james(uid=1000)
2024-12-28T16:42:18.133593-05:00 pop-os sshd[13583]: Received signal 15; terminating.
2024-12-28T16:42:18.214609-05:00 pop-os sshd[13594]: Server listening on :: port 22.
2024-12-28T16:42:18.217743-05:00 pop-os sudo: pam_unix(sudo:session): session closed for user root

psherman · December 28, 2024, 9:54pm

Did you get an error? What was it?

ninjanoir78 · December 28, 2024, 10:09pm

nothing happens

psherman · December 28, 2024, 10:10pm

Nothing at all?

Maybe a dns issue?

frollic · December 28, 2024, 10:12pm

Keep in mind your Ubuntu box isn't using your router's DNS server, unless it's blocked upstream.