Or did you set up a VirtualHost in Apache on port 81 by mistake?

[edit]
or leave the port number out of a VirtualHost config?
[/edit]

So something is very wrong. What did you install from the command line? Try the command "history | grep yum".

I'm sure yes

ClearOS release 7.9.1 (Final)

Are you sure you are running ClearOS and not Centos? What is the contents of /etc/centos-release?

I believe I installed using command lines

That does not look right as you should be getting a ClearOS splash screen. Did you install app-web-server or the Web Server app from the marketplace?

Take a look at the page that opens in place of the control panel

Opening the Apache Server Home page now ... rsrsr

Starting Nmap 6.40 ( http://nmap.org ) at 2021-03-17 15:23 -03

Nmap scan report for localhost (127.0.0.1)

Host is up (0.00044s latency).

Other addresses for localhost (not scanned): 127.0.0.1

Not shown: 985 closed ports

PORT      STATE SERVICE

22/tcp    open  ssh

25/tcp    open  smtp

53/tcp    open  domain

80/tcp    open  http

81/tcp    open  hosts2-ns

139/tcp   open  netbios-ssn

389/tcp   open  ldap

445/tcp   open  microsoft-ds

465/tcp   open  smtps

587/tcp   open  submission

1875/tcp  open  westell-stats

3260/tcp  open  iscsi

5432/tcp  open  postgresql

8200/tcp  open  trivnet1

10025/tcp open  unknown

Device type: general purpose

Running: Linux 3.X

OS CPE: cpe:/o:linux:linux_kernel:3

OS details: Linux 3.7 - 3.9

Network Distance: 0 hops

Just connect a workstation to the LAN port. If you have configured it as a DHCP server, the LAN port should have an IP address and your workstation would then also get an IP address. Then you just go to https://your_ClearOS_LAN_IP:81.

Nick thanks for responding!

How would access through the LAN port be?

What mode is ClearOS installed in? Gateway, Standalone or Standalone with firewall? I suspect you have closed the firewall to your external interface (which is the only interface in Standalone mode). If you are in gateway mode you should still be able to access the webconfig from the LAN port. Otherwise, temporarily add the following firewall rule at the command line:

iptables -I INPUT -p tcp --dport 81 -j ACCEPT

If that works, in the webconfig Incoming Firewall, open the port again, but as soon as you do, anything you have done to the firewall from the command line will be lost.