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I cannot create a demo account.  Metaquotes-Demo server ping time is less than 50ms.  I cannot ping updates.metaquotes.net.
Documentation on MQL5: Standard Constants, Enumerations and Structures / Environment State / Account Properties
  • www.mql5.com
Standard Constants, Enumerations and Structures / Environment State / Account Properties - Documentation on MQL5
 

What build number do you use?

Similar problem was solved in 412 build. 

Documentation on MQL5: Standard Constants, Enumerations and Structures / Environment State / Client Terminal Properties
  • www.mql5.com
Standard Constants, Enumerations and Structures / Environment State / Client Terminal Properties - Documentation on MQL5
 
I have 411 build.  I'll try download again.
 
Sigh!.  The download site still has build 411.
 
The file mt5setup.exe file version says 420 build.  But after install, About says 411.
 
Which OS type is on your PC?
 
Windows Vista Home.
 
fxyekim:
Windows Vista Home.
It works now on Build 421.  I had to delete terminal.exe and install over the existing folders.  The new build was applied.
Reason: