Access via static IP to internal server erratic / odd

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Christopher Hipskind

• December 05, 2025 17:48

Using ATT BGW320-500 and Firewall Purple

I'm pretty sure both the ATT Router and Firewall are set up correctly, but I may be missing something.

I instructed the handful of remote users to use one of the static IPs (ATT gave us a total of 5) with a port number, to access a server with RDP enabled.

Everyone can remotely access the server during the day but usually, in the morning, and not always at the same time, it takes about 20 attempts to finally get in. Oddly, usually, once one user has connected, everyone else can log in.

This is driving me, and the users, nuts.

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  Firewalla

  • December 05, 2025 17:53

  How are you doing the RDP connection? via port forwarding from ATT to firewalla and firewalla to your RDP device? check that first. 

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  Christopher Hipskind

  • December 05, 2025 18:13

  Thanks for such a quick response!

  The ATT router is set up as Passthrough. The Firewall Purple is set up as a router.

  Under NAT setting on the FP, Source NAT is On. The Source Network / Local Network ip is the FP itself.

  No NAT Rules.

  No NAT Passthrough options selected.

  Port Forwarding is to the hostname of the internal server with a TCP port. Rule is Always, Allow: All Sources.

  UPnP is disabled.

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  Firewalla

  • December 05, 2025 18:37

  The problem is unlikely at the network layer if some of your services works after the first one (especially the port/protocol is TCP). Are you able to read the RDP server logs? may be something there can give a better clue. 

   

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  Christopher Hipskind

  • December 05, 2025 18:52

  It's so odd ...

  So inside the office the RDP connection to the server never occurs. Users connect to it's internal IP or hostname with the port number without any issue.

  However, yes, I did take a look at MS eventviewer and didn't see anything weird there.

  I have a feeling it might be the ATT router. I am trying really hard not to contact their support because it's usually a pain in the neck until I get someone decent.

  I listed the changes I made to the ATT router to set it up as passthrough. If I send you a text file with the settings, can you take a quick look and see if I missed something?

  Thanks again!

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  Firewalla

  • December 06, 2025 00:40

  Since your connections are getting through, your best bet is look at the logs to see what is rejecting your connection. (I do remember Microsoft also has its own firewall, not sure if it is an issue or not) 

  Try a different port you used publicly, may be something there that the ISP may be filtering. 

  Sorry, we can't help with ATT configurations. 

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