1、telnet IP port

略.....

2、ssh -v -p port 用户名@IP
通：
[root@localhost ~]# ssh -v -p 8080 root@192.168.230.163
OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug1: Connecting to 192.168.230.163 [192.168.230.163] port 8080.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
.......................
不通：
[root@localhost ~]# ssh -v -p 9090 root@192.168.230.163
OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug1: Connecting to 192.168.230.163 [192.168.230.163] port 9090.
debug1: connect to address 192.168.230.163 port 9090: No route to host
ssh: connect to host 192.168.230.163 port 9090: No route to host
3、curl IP:port
通：
[root@localhost ~]# curl 192.168.230.163:8080
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Apache Tomcat/8.5.78</title>
        <link href="favicon.ico" rel="icon" type="image/x-icon" />
        <link href="tomcat.css" rel="stylesheet" type="text/css" />
    </head>
    .................
不通：
[root@localhost ~]# curl 192.168.230.163:9090
curl: (7) Failed connect to 192.168.230.163:9090; No route to host
4、wget IP:port
通：
[root@localhost ~]# wget 192.168.230.163:8080
--2023-04-12 00:56:03--  http://192.168.230.163:8080/
Connecting to 192.168.230.163:8080... connected.
HTTP request sent, awaiting response... 200
Length: unspecified [text/html]
.....................
不通：
[root@localhost ~]# wget 192.168.230.163:9090
--2023-04-12 00:56:16--  http://192.168.230.163:9090/
Connecting to 192.168.230.163:9090... failed: No route to host.
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