[Connecting] Spontaniously impossible

Good day,
I searched, but I couldn't find any problem like this, so I decided to make a topic.
For some reason it spontaniously became impossible for my players to join the server, without any changes (I made some, but it doesn't work with an unchanged server as well).
The port I am using has been forwarded, I even tried it again. Yesterday evening it just became impossible to connect from another computer.
I tried running builds 860 and 935 which worked perfectly before, both giving the same result.
There aren't any errors in the console, the port is still forwarded but still my players can not connect.
They are getting the screen as included in this post.

The only plugins I am running are HomeX and mcMMO.

Does anyone have a clue? Thanks a lot in advance^^

 

I hate bumping, but... I really want to get my server back up and running. I know I can't give much information, but it just spontaniously happened, without a reason, nothing changed.
What I can say, I have a Speedtouch 720 as a modem, maybe that helps?
Sorry for the bumping.

 

did your ip change?

 

No, it is still the same.

 

While your IP may not have changed, perhaps your ISP has blocked the port on their end. The best way to test this is to have someone (or some program) test your connection from the outside. http://canyouseeme.org/ for instance lets you do this. 25565 is the default minecraft server port.

 

It says:

Error: I could not see your service on ******* on port (25565)
Reason: Connection timed out

But it says that with every port I try.

 

That means your ISP is filtering your ports. I'd suggest calling them to see what's up.

 

To be honest, who are the ISP? I'm from the Netherlands, so it probably has a different name here

 

Internet Service Provider, as in who is providing you internet.

 

Like UPC or Chello or KPN, Ziggo (Ye, Netherlands too )

 

Ah, thank you. Makes sense. Sorry, I do not know all the shortenings in english.

 

No problem, I hope they can fix this for you!

 

I found out what the problem was. For some reason the IP of my PC changed, so I had to change some stuff in the portforwarding. Everything works now.
When someone asked if my IP changed, I thought he meant the server IP, I never thought of the PC itself.
Anyway, thanks everyone^^

 

Yeah, you should try setting your computers internal network address to a static one. You can do this by opening the network connections window and right clicking your network card from the list and hitting properties. Once you hit properties, you can select "Internet Protocol Version 4 (ipv4)" from the list and hit "Edit". Then you can set a static internal IP address so that you won't have this issue again.