Thanks,
What we want to try and do is check if any IP filtering is happening in your modems firewall. This will be about the home modem but the same would apply to the work modem; just how to get to the firewall would be different.
Firstly you'll need login access to the modem (username and password). If you bought the modem off the shelf retail then you will have these details somewhere. If your ISP provided the modem to you with your internet plan you may need to get the username and password from them.
Access the modems configuration by putting
192.168.1.1 into your web browsers address bar. This is the default address for the modem. If you don't get a login screen we'll have to find the correct address.
Once logged into the modem, along the top of the page click the advanced icon, then on the left side click the firewall link. From there we need to find "IP Filtering" which I don't know exactly where to tell you it is as I can't find a screen shot anywhere.
If IP filtering is disabled then we are done, there is no UDP blocking happening in your modem and you can log out of the modem and we'll move onto looking elsewhere for the problem.
If IP filtering is enabled we need to check what's being filtered.
IP Filtering screen in Dynalink RTA1025WYou'll need to check both outbound and inbound rules. First look down the protocol column to see if there are any entries for UDP. If there are check the entry in the Allow column for it. If it is not allowed you'll need to allow it (click the pencil in Edit column). After allowing UDP you may need to save the modems configuration before the setting will take effect.
Hopefully this will be a "got it on the first try" solution but don't bet on it.
- Tim