Hello 

Since a few Days my Archer C5400 is not portforwarding at all. All Services that need a Portforward are not working. FTP Server for Example or a Media Server. I rebootet the Router a few Times. I Checked anything. The Ports are Forwarded correctly (Image) in fact i did not change anything so it should  be fine. I have no clue what to do next but to be honest i'm pretty unhappy with this device. Since i got it i only have Problems. The Portforwarding is not the only Issue but for the Moment the most important. 

My Configuration looks like this. I got the ISP's Modem and the Router. The Router has a wired Connection to a TV and to a WD TV Live Mediabox. A third Cable goes to a Powerlan. The PowerLan Connection is going into my Office where i got one Client connected. That is the Main Workstation (WKS1 IP: "1.181"). Then i got a few Devices that connect trough WLAN. One of them is the Server (SRV1 IP: "1.180"). As you see in the Image the Ports are forwarded correctly and also in my Filezilla FTP Server (Image 2+3) those Settings are the same. 

Filezilla Port Configuration

When i connect to the FTP Server with the Internal IP of the Server (1.180), instead with the outside IP that needs to be forwarded, anything workes just fine. It's only a Problem with connections that come from outside. Same thing with my Plex Media Server. If i start it on my Tablet and use WLan anything is just fine. As soon i change to the 4G Connection of the Tablet with a external IP the Plex Server is no reachable.

1: Inside Network 
2: Outside Network tht needs the Ports to be forwarded

 

Just for Fun i installed Soulseek (Like old times Napster) that also requires a Open TCP Port. I choosed Port "57495" and made a new PortForward. Then i tested it with a test you can run inside Soulseek to check if anything is fine and the Result came back negative again.  

I can Ping my IP without any Kind of Problem. Also my Internal Devices are pingable without any Kind of Issue. As soon i test for open Ports the Result is negative. 

What i will do today just to test is the following. I will connect another Router i have here and check if anything is ok with that Router. Once done i will update the Result's here. In the mean Time i'm happy about any Idea that might could fix the Problem. 

Thanks in advance for any Idea Guys