Wireless card Problem

Hi Kenan97, have you checked that the MTU (Maximum Transfer Unit) is OK.
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To see your present MTU. (Maximum Transfer Units).
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Open a command prompt, by typing cmd in the start menu search box, then type:-
netsh interface ipv4 show subinterfaces
then press enter.
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To find your optimum MTU.
Most common are 1392/1400/1432/1492 (1432 is the recommended MTU for Talk Talk but may not work for all).
You can try these ones, or you can diagnose the exact figure yourself as below. Or ask your ISP.
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First, log into your router and set MTU to 1500, just for testing purposes.
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Open a command prompt, as above. In the cmd window type:-
ping -f -l 1472 google.co.uk
(the l is a lower case L, and there are spaces after ping, f, l, and 1472)
You may get something like "packet needs to fragment but 'DF set', or 100% packet loss, or 'request timed out'.
If you do, try again, reducing the value of 1472 by small increments until you find the largest number
which works with no lost packets. Then add 28 to this number. Now reset the MTU in your router.
EG: max value with no packet loss = 1464 + 28 = optimum MTU of 1492.
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To change the MTU value in your computer.
Open a command prompt (cmd) right click, and 'Run as administrator', type:- ipconfig/all
Make a note of the exact names of the network devices.
They are the words directly after “adapter". Eg: “Local Area Connection" or "Wireless Network Connection".

Now use one of the following commands to set the MTU value:-

netsh interface ipv4 set subinterface "Wireless Network Connection" mtu=1432 store=persistent
or
netsh interface ipv4 set subinterface "Local Area Connection" mtu=1432 store=persistent

Change 1432 to your previously found result.

Kenan97 said:

Thanks for the reply! Am I doing something wrong?

YES! you will find the answer faster by asking your ISP for correct MTU to be set in your router.

People cannot connect to your server are you using DHCP or have you assigned a fixed(static) ip address to the computer hosting the minecraft server?

What firewallare you using and try as a test disabling it and see if you can then connect after test re-enable the firewall and let us know the results.