How can I access the Genymotion emulator through an IP address?

Question

When I load my Genymotion emulator, it is assigned an IP address - something like 192.168.56.101 . I install the application on the device and my application launches a small web server on port 8181 .

Previously, I could hit this server at the URL: http://192.168.56.101:8181/ , but after upgrading to Genymotion and Virtual Box, I can no longer do this.

I can use the service through the local url ( http://127.0.0.1:8181 ) if I use adb port forwarding using the adb forward tcp:8181 tcp:8181 , so I know that the service is working.

How to configure your network to access the service through the emulator IP address?

Update

When I run nmap scan on the device, I get the following output:

 C:\WINDOWS\system32>nmap -vv 192.168.56.101 Starting Nmap 7.12 ( https://nmap.org ) at 2016-08-23 12:50 Eastern Daylight Time Initiating ARP Ping Scan at 12:50 Scanning 192.168.56.101 [1 port] Completed ARP Ping Scan at 12:50, 0.50s elapsed (1 total hosts) Initiating Parallel DNS resolution of 1 host. at 12:50 Completed Parallel DNS resolution of 1 host. at 12:50, 0.02s elapsed Initiating SYN Stealth Scan at 12:50 Scanning 192.168.56.101 [1000 ports] Discovered open port 24800/tcp on 192.168.56.101 Discovered open port 5555/tcp on 192.168.56.101 Completed SYN Stealth Scan at 12:50, 1.22s elapsed (1000 total ports) Nmap scan report for 192.168.56.101 Host is up, received arp-response (0.0020s latency). Scanned at 2016-08-23 12:50:34 Eastern Daylight Time for 4s Not shown: 997 closed ports Reason: 997 resets PORT STATE SERVICE REASON 5555/tcp open freeciv syn-ack ttl 64 8181/tcp filtered unknown no-response 24800/tcp open unknown syn-ack ttl 64 MAC Address: 08:00:27:DB:D1:0D (Oracle VirtualBox virtual NIC) Read data files from: C:\Program Files (x86)\Nmap Nmap done: 1 IP address (1 host up) scanned in 4.62 seconds Raw packets sent: 1002 (44.072KB) | Rcvd: 1032 (43.968KB) 

As you can see, port 8181 displayed as filtered. Was there any firewall introduced in Android 5.1 / 6 that could cause this? I can access port 8181 for Android 4.4 emulators, but not for 5.1 / 6 emulators.