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TCP port 1720 open

TCP port 1720 open

TCP port 1720 open
TCP port 1720 open
3 weeks ago
Model: Deco BE11000  
Hardware Version:
Firmware Version: 1.1.7

Hi all,

I’m running a Deco BE11000 (firmware 1.1.7) and noticed something odd when scanning open ports on my router. The device is listening on TCP port 1720.

From what I understand, 1720 is typically used for H.323 call signaling (legacy VoIP/video conferencing), but I haven’t knowingly enabled any services like that. The only custom configurations I have on the Deco are:

An incoming VPN server

An outgoing VPN client for one desktop

No other special features are turned on.

Does anyone know why the Deco would be listening on 1720 by default? Is this part of the firmware (maybe some ALG or VoIP helper service), or something I should be concerned about? If it’s not needed, is there a way to disable it?

Thanks in advance!

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#1
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5 Reply
Re:TCP port 1720 open
3 weeks ago

  @Rhaadc 

 

I beleive this should help 

 

https://www.tp-link.com/us/support/faq/2422/

 

Let me know if that doesn't fix the issue 

Need help with the Deco app, setup, Ethernet backhaul, network switch or rolling back firmware? Router or AP mode? https://community.tp-link.com/us/home/forum/topic/699816?page=1
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#2
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Re:TCP port 1720 open
2 weeks ago

  @HelpFixDecoApp I disabled the SIP ALG feature and rebooted the router and that port is still listed as being open.

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#3
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Re:TCP port 1720 open
2 weeks ago
Need help with the Deco app, setup, Ethernet backhaul, network switch or rolling back firmware? Router or AP mode? https://community.tp-link.com/us/home/forum/topic/699816?page=1
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#4
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Re:TCP port 1720 open
2 weeks ago

  @HelpFixDecoApp  and @Rhaadc 

 

I am not familiar with why this port would be open on a Deco, but I am engaging with internal teams to find out.  I will jump back in here once i know more. 

What's New? Sync Your Tapo Doorbell and Door Lock Optimize Your Network with the Wi-Fi Toolkit App Join our Official Subreddits: r/tplink, r/tapo, and r/omada_networks
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#5
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Re:TCP port 1720 open
a week ago

  @Rhaadc 

 

Engineering got back to me over the long weekend.  Port 1720 is not used by default on the Deco.   To help they would like to collect screenshots of the port Scans from WAN and LAN.   Because this may be sensitve material we would ask the following be used and an email sent

 

To help assist and streamline the identification of the behavior, we recommend sending an email to forumsupport.usa@tp-link.com with the following information:

Subject: [Forum Escalation][ID 1601694] Deco and Port 1720 Usage

Forum Nickname: [User Provided]

Thread URL: https://community.tp-link.com/us/home/forum/topic/838838 

Model&Version: Deco BE11000

Description: [Please describe the nature of the concern ]

Any Other Relevant Information: Please provide screen captures of the port scans from WAN and LAN

 

Send to:  ForumSupport.USA@tp-link.com  

 

 

 

What's New? Sync Your Tapo Doorbell and Door Lock Optimize Your Network with the Wi-Fi Toolkit App Join our Official Subreddits: r/tplink, r/tapo, and r/omada_networks
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#6
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