How to open ports in Windows 2k8 r2?

Question

Windows Server

Good afternoon.
I can't figure out how to open ports in Windows 2k8 r2.
I tried creating a rule through Windows Firewall -> Inbound Rules, but it didn't work.
Port 143 is open on the router.
If I telnet 192.168.0.100 143 then I get:

Connecting to 192.168.0.100...Failed to open a connection to this host, on port
143: Connection failed

nmap:

Nmap scan report for 192.168.0.100
Host is up (0.0010s latency).
PORT STATE SERVICE VERSION
143/tcp filtered imap
MAC Address: 00:1B:FC:CB:31:2D (Asustek Computer)
Too many fingerprints match this host to give specific OS details
Network Distance: 1 hop
TRACEROUTE
HOP RTT ADDRESS
1 1.00 ms 192.168.0.100

If I go, for example, to 2ip.ru , then he writes to me that the port is closed.
The Symantec Endpoint Protection Manager is set to allow all incoming and outgoing traffic.

Answer 1

What is running on port 143?