Remmina connection problem

Today, I suddenly got the error when using Remmina Remote Desktop Client in ubuntu 12.04. The error is like below:

 Unable to connect to RDP server hostname

After a search, all the solutions as below dose not work for me:

1. Change connection profile:
Advanced- Security from "Negotiate" to "RDP" or "TLS"
After doing this, I got a different error, said the "username or password is not correct". And after I tried to re-type-in the password several times, it still did not work. And keep get this error.

2. Delete the host config file:
rm ~/.freerdp/known_hosts 
Nothing change after I delete the file

Finally, recreate the connection worked for me.

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