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SPI Firewall breaks outbound RDP connections

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SPI Firewall breaks outbound RDP connections

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
SPI Firewall breaks outbound RDP connections
SPI Firewall breaks outbound RDP connections
2023-09-22 14:16:26 - last edited 2023-09-22 14:17:44
Tags: #SPI Firewall
Model: Archer AX3000  
Hardware Version: V1
Firmware Version: 1.2.3 Build 20230603

Enabling SPI Firewall on the router is breaking outgoing RDP connections for me.

 

Connecting the PC directly to the fiber modem, or using a LTE modem works perfectly.

Disabling the SPI firewall in the router's admin also works.

 

I can't seem to find any management options to this firewall functionality.

Is there something I'm missing that allows us to enable RDP through?

 

Thanks in advance.

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Re:SPI Firewall breaks outbound RDP connections
2023-09-25 02:34:30

  @uKER 

 

Hi, thank you very much for posting on TP-Link Community.

Are you trying to control another computer in the same LAN network or in external network via RDP connections? 

 

Currently we are only able to enable or disable SPI Firewall, but no specific rules can be configured.

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Re:SPI Firewall breaks outbound RDP connections
2023-09-25 16:00:25 - last edited 2023-09-25 16:44:50

Hey there, @Sunshine.

Thanks for your reply.

I'm accessing the RDP host through a VPN, so it's a local IP address (192.168.*)

 

Now, the problem just got worse.

I now have SPI firewall turned off and it's still not working.

I've narrowed the problem down to the outgoing TCP connection on port 3389 being denied.

ie, ping works, but telnet to the host on port 3380 fails, while it does work over LTE or if I connect the PC straight to the fiber modem.

 

Is there any logs I can look at on the router to check what's going on?

Any suggestions are welcome.

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