Can't access to the login form from a VLAN network

[jiju8420]

Hello everyone,

I am seeking your help because I have not found a solution to my problem after trying for a long time to solve it on my own. Thank you in advance for any help you can provide. I am using cockpit-project version 188 and I want to be able to access the web server from all network interfaces on my system. My Linux system is cross-compiled with Yocto (Kirkstone release). I want to communicate with cockpit-project from all network interfaces on my system. My machine has an Ethernet interface and a VLAN network created from the Ethernet interface.

Currently, I am able to access the web server from the IP of the Ethernet interface (main network), but I am having issues accessing the web server from the VLAN network (virtual network). When I try to access the web server from the VLAN network, the HTTP request is properly received by the server, the server processes the request and tries to send back the response but the browser does not receive the response.

Here's what I have tried and observed:

• TLS has been disabled by running cockpit-ws --notls
• Listening on port 80
• HTTP test to /ping from VLAN is OK
• HTTP test to /ping from main network is OK
• The browser displays the login form from the main network but not from the VLAN network
• Browsers used: Firefox and Chrome

As shown in the below capture, the server-side IP on the VLAN network is 192.168.6.4 and on the client-side, the IP is 192.168.6.3.

• TCP 3-Way Handshake Process is OK (packet 8)
• HTTP GET request to / is received on the server-side (packets 11 and 12)
• The server sends back the response (packet 18) but the client does not acknowledge it
• The server keeps trying to resend the response (TCP retransmission)
  

We can also see with the netstat command that data is still present in the data queue to be sent before closing the TCP connection

netstat -n -t
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address         State
tcp        0  38886 ::ffff:192.168.6.4:80   ::ffff:192.168.6.3:65127 FIN_WAIT1

Does anyone have an idea where the problem could come from? I would be very grateful if you could help me!

Have a nice day!