Multiple inheritance

I have hierarchy, that contains one base interface class -
IConnection,
and two derived interfaces: IClientConnection and IServerConnection

=================

class IConnection
{
public:
    virtual void Send() = 0;
};

class IClientConnection : public virtual IConnection
{
public:
    virtual void Connect() = 0;
};

class IServerConnection : public virtual IConnection
{
public:
    virtual void Accept() = 0;
};

=================

I also have a realization for base interface

=================

class Connection : public virtual IConnection
{
public:
    virtual void Send()
    {
    //...
    };
};

=================

For two other interfaces I want to use existing realization of base
interface.

=================

class ServerConnection : public IServerConnection,
                         piblic Connection
{
public:
    virtual void Accept();
};

=================

I inherit Connection, because I don't want to duplicate the code from
Connection::Send();

When I compile this code with Microsoft compiler, I get following
errors:
warning C4250: 'ClientConnection' : inherits
'Connection::Connection::Send' via dominance.
Is there a better way of doing this? How can I avoid multiple
inheritance and code duplication?
I really like an idea of such inheritance. Why is it bad?

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