Access server machine from an Android device using IP address

Here is a totally wierd scenario that I caot find solutions anywhere. Purpose: testing a website using an Android device's browser both coected to the same WIFI. Results: - Other PCs can coect without problem to that server machine using an IP address which is 192.168.1.9 on port 80. - Only the Android machine (IP 192.168.1.199) caot coect to the server (also using an IP address).

I have tried everything, every resource found on the Net but no luck.

Please help.