i get the same error "unable to connect to battle.net server you may be trying to connect an invalid battle.net server. if you are using a modem u may need to manually connect to the internet before u can connect to the battle.net server."
I was able to play like 1 week ago and al of sudden i got loged off and i got this error ever since i did nothing to get ban, all i did was log in and check my friends and my clan, then i got logged off.

X[d_conkerpro ~

I'm not showing a restriction on your connection. I would suggest that we start troubleshooting with a DNS flush:

For XP:

1. Click Start, then Run.
2. Type in CMD
3. When the command prompt comes up type in the following in succession, all without the quotes:

"ipconfig /release" press Return
"ipconfig /renew" press Return
"ipconfig /flushdns" press Return

4. Close the DOS window and try WoW.

For Vista:

1. Click Start, then Run.
2. Type in CMD. When you see the command prompt come up, right-click and choose "Run as Administrator."
3. When the window comes up, type in the following in succession, all without the quotes:

"ipconfig /release" press Return
"ipconfig /renew" press Return
"ipconfig /flushdns" press Return

4. Close the DOS window and try WoW.

For Mac OS X:

1. Navigate to /Applications/Utilities/ and launch Terminal.
2. Copy/Paste the following:
For Leopard (10.5):
dscacheutil -flushcache
For Tiger (10.4) and Panther (10.3):
lookupd -flushcache
3. Press return.

Elitepartyhati ~

Your connection has been temporarily restricted from Battle.net. This restriction is realm-specific and can last up to 2 weeks.

It can happen for any of the following reasons:
- Using an invalid CD key
- Rapidly connecting and disconnecting to Battle.net
- Creating or joining numerous games within a short time period such as "Magic finding" or "Baal runs"
- By the use of "add-on programs"
- Chat channel abuse
- Failed login attempts
- In game latency caused by excessive spell effects

We are unable to lift these restrictions early or tell exactly why the restriction was placed on your connection.