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RamrodJohn
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10 Messages

Thu, Oct 26, 2017 1:34 AM

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

4 y 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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