Issue With CSF , UDP Ports not Filtering.

piyushmaheswari

Well-Known Member
Apr 18, 2020
74
2
8
India
cPanel Access Level
Root Administrator
Hello buddies , previously when I was install CSF on my server then in check-host.net my ip's UDP Ports are showing Opened or Filtered.
But in my new server I installed CSF but in check-host.net UDP Ports showing connection refused.

These UDP_IN and UDP_OUT ports in firewall configuration :
UDP_IN = 20,21,53,80,443
UDP_OUT = 20,21,53,113,123,873,6277,24441

Please help me to solve this issue.
 

cPanelLauren

Product Owner
Staff member
Nov 14, 2017
13,296
1,252
313
Houston
Hello,,

Are you saying that the ports you listed here:
Code:
UDP_IN = 20,21,53,80,443
UDP_OUT = 20,21,53,113,123,873,6277,24441
Are in CSF as being open for UDP in and out respectively are showing closed when you check them externally? If so then the issue is most likely an external firewall blocking these ports.