Network Topology
irrelevant
Problem Description
The FTP client cannot connect to the UIS background and cannot use transfer software such as SFTP or WINSCP
Process Analysis
Background Login A node can transfer files to other nodes using SCP. The transfer software cannot be used on the terminal because the ROOT login permission is not enabled for the SSH service of the UIS. The configuration is as follows.
1. Query the SSHD service status.
[root@cvknode2 ~]# systemctl status sshd
● sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2021-10-08 14:23:27 CST; 1 weeks 5 days ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 4704 (sshd)
Tasks: 3
Memory: 85.5M
CGroup: /system.slice/sshd.service
├─ 4704 /usr/sbin/sshd -D
├─896815 sshd: [accepted]
└─896823 sshd: [net]
Oct 21 13:48:42 cvknode2 sshd[896423]: Accepted publickey for root from 172...ek
Hint: Some lines were ellipsized, use -l to show in full.
2. Edit the SSHD config file
vi /etc/ssh/sshd_config
PasswordAuthentication yes
PermitRootLogin yes
service sshd restart
[root@cvknode2 ~]# systemctl restart sshd
[root@cvknode2 ~]# systemctl status sshd
● sshd.service - OpenSSH server daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2021-10-08 14:23:27 CST; 1 weeks 5 days ago
Docs: man:sshd(8)
man:sshd_config(5)
Main PID: 4704 (sshd)
Tasks: 1
Memory: 82.5M
CGroup: /system.slice/sshd.service
└─4704 /usr/sbin/sshd -D
Oct 21 14:03:40 cvknode2 sshd[2344439]: Accepted publickey for root from 172...k
Oct 21 14:03:46 cvknode2 sshd[2353355]: Accepted publickey for root from 172...k
Oct 21 14:03:46 cvknode2 sshd[2354110]: Accepted publickey for root from 172...k
Oct 21 14:03:52 cvknode2 sshd[2362546]: Accepted publickey for root from 172...k
Oct 21 14:03:57 cvknode2 sshd[2369976]: Accepted publickey for root from 172...k
Oct 21 14:03:58 cvknode2 sshd[2371699]: Accepted publickey for root from 172...k
Oct 21 14:03:59 cvknode2 sshd[2373204]: Accepted publickey for root from 127...k
Oct 21 14:03:59 cvknode2 sshd[2373609]: Accepted publickey for root from 127...k
Oct 21 14:04:00 cvknode2 sshd[2375299]: Accepted publickey for root from 172...k
Oct 21 14:04:03 cvknode2 sshd[2381645]: Accepted publickey for root from 172...k
Hint: Some lines were ellipsized, use -l to show in full.
Solution
1.Edit the SSHD config file:
vi /etc/ssh/sshd_config
PasswordAuthentication yes
PermitRootLogin yes
2.Then restart the service:
service sshd restart
