Tutor
•
10 Messages
Are any inbound ports blocked?
I want to run a personal web server and email server. I read some old posts that indicate that ATT&T blocks some inbound ports including ports 25 and 80. Any truth to this? (I have a residential fiber account and 5268AC gateway).
_xyzzy_
Expert
•
15K Messages
6 years ago
Here's all the blocked ports (reference😞
Port
Transport
Protocol
Direction
Threats
0
TCP
Reserved
Both
Reserved Port
19
UDP
Chargen
Both
Reflective DDOS
25
TCP
SMTP
Outbound
SPAM, Malware
68
UDP
BOOTP
Outbound
DHCP server spoofing
123
UDP
NTP
Both
Reflective DDOS
135
TCP
NetBios
Both
Worms, Malware, Reflective DDoS
139
TCP
NetBios
Both
Worms, Malware
445
TCP
MS-DS SMB
Both
Worms, Malware
520
UDP
RIPv1
Both
Reflective DDOS
1900
UDP
SSDP
Both
Reflective DDOS
3479
TCP
Twrpc
Both
End user device instability
7547
TCP
CWMP
Inbound
End user device instability
61001
TCP
IPDR
Inbound
Data exposure, end user device instability
So yes, 25 is blocked (email spam control). Don't know why you would think 80 (http) would be blocked.
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