Hello world,
I am currently facing an ugly problem after our admin installed windows updates.
We have a service running on a server in our local network.
It registers itself on startup in a database, writing its ip and the number of a dynamically assigned port for UDP communication.
Clients in our network read the values on startup and send their IP and their dynamically assigned port via UDP to the server, so that the server can register them and was then able to send information via UDP to the clients for various purposes.
Everything worked fine until the admin updated my Win 7 installation during my vacation. It just doesn't work anymore.
Fact is that it worked before, and it still works for all other machines that are using XP.
I am not well educated on this kind of topic so I googled a lot yesterday in order to understand the problem so I can fix it. There were some posts regarding this issue, but it seems that most of them were able to work around this opening ports in their windows firewall.
It also seems that there was a change in one of the last updates, but it just doesn't make sense to me.
All firewalls are disabled in our local network.
I tried to use Wireshark to find out if any packages are sent, but it doesn't seem to send anything, even if the debugger show the tries in the console....
Our network uses both IPv4 and IPv6 enabled.
I can ping the servers IP but not telnet it using ip and port (I have no deep knowledge on telnet so far, so this information might be of any value).
So now I am stuck and the admin is away for the next weeks (its always the same, isn't it?) for a vacation.
UPDATE:
we just figured out that only Win7 64 bit machines are affected... Win7 32 bit seems to work.
That was wrong, unfortunately our admin installed a virtual network adapter (Oracle Virtual Box) on all the Win 7 64bit machines together with the updates... So it wasn't obvious to spot the problem right away...
Disabling the virtual network adapter did the job and everything started to work again.
best regards and have a nice day
Andy