If a typo it should also affect the module v2 I presume. Since the address registered with WHMCS is the same.
Right, what I was meant was simply to make sure you've not mistyped it when re-entering it for the v3 module.
You PMed me your CCv3 URL and I'm able to connect to it with no problems with the v3 module from here:
<?xml version="1.0" encoding="UTF-8"?><centovacast version="3.0.0b2" host="centova10.xxx.com.br:2199"><response type="error"><message>Invalid username or password</message></response></centovacast>
Obviously it's returning a password error since I don't know your password, but the error you quoted previously indicates that your WHMCS module can't even *connect* to the Centova Cast web server, which I was able to do with no problems. So I've confirmed that the issue is neither with the module nor with your Centova Cast v3 installation.