I can not login in the game. When I enter the username and password, and click OK, an error is displayed or nothing happens. All that is written in the FAQ I've used. I hope to be adequate and useful advice.
P.s: sorry for my bad english

What did the error said?
Do you have a slow internet connection?
Try reinstalling it
Invalid Account or Password?
wait DC to respond

Bad idea because everything I know is in the FAQ. I can't help if the FAQ can't help.

Internet connection fast.
Reinstalled.
Username and password are correct.

I've seen a few threads years ago and there was a similar problem, and you helped them. Could not be able to assist me?
P.s.:sorry my bad english

You obviously did not understand what I just said. Again: I can't help you. I could just repeat exactly the same stuff which is already in the FAQ.

You forgot to answer the first question, "What did the error said?"

Can you also please provide us a screenshot or picture of the error?

I haved the same problem, like Max_Fereira. Yesterday (7.04.2013) on my cs2d, I was trying to login and it sayed "trying to login", I waited some minutes and I could not login. But today (8.04.2013) I can login, I do not know why I could not be logged yesterday.
I have fast connection;
The account name and password are correct;
It doesn't say "error" or something like that;

@ Max_Fereira: Try this
Wait for a few minutes then try logging in (be patient) or log out and log in repeatedly
Go to options then click the "NET" tab, enter your real username and a fake password, then the status will turn to "Failed to login", then go back to the "NET" tab and enter your real password.
Check your firewall
If none worked out, try searching to other threads maybe it will help you

Simple answer: There were problems with the U.S.G.N. yesterday. The serverlist wasn't available either (just the cached one).

Edit: Same happend again. Should work again in a few minutes. I don't know why this happened and will examine this.

Ofcourse, this is caused by the crashed harddrive:

http://unrealsoftware.de/forum_posts.php?post=350683&start=0#post350683

@ gotya2: Stop making nonsense post

@ DC: Did the problem of U.S.G.N started years ago or just few days ago?

@ iLoveUS: There are and were always people claiming that they can't login but it wasn't the fault of the U.S.G.N. in most (or all?) cases.

The recent login problems were caused by the U.S.G.N. in the last days though and affected everyone as far as I can tell.

The service is currently up and running normally as always.

I can't login either. I'm currently connecting to a public network because I ran out of internet. Does this login problem have to do with U.S.G.N. or because I'm not connecting to my router?

U.S.G.N. is working fine at the moment and I can login. So it's probably a problem on your side.

I have the same problem. There is a solution. 1) Install the old version of the game (1.2.1). 2) Enter the username and password. 3) If you log in, close the game, open the folder, copy usgn_pw.dat, insert it into the game folder with the version 1.2.2. 3) Profit. There is one bug - if you are playing on the server for a long time (an hour), it is dropped. Have to repeat this several times.
This method works by 75%

when i tried to open cs2d it said that delete the light engine
then when i closed it i log in my u.s.g.n it turns green but when i play a map it say pls log-in your usgn i tried to install and delete and install and delete again then i install again it will happen always........ Pls Fix This..............

The U.S.G.Ns works fine. I've tested it.

@ russelgwapo: Maybe you have problem on your connection

hey mine is working

Go and uninstall the full game

then download the zip file of cs2d and extract it in the cs2d folder

and the login

it will login successfully

whats ***** is in the world see in portal page