I think that the name resolution was a problem of MSDTC, because the single queries works fine on both server, and only the distributed transaction don't work.

Thanks

I resolve this problem using WINS name resolution on both server.

This is not specified in Microsoft documentation, but this is the only way I find to resolve it

Thanks

No, there are not firewall between the two domain, and I'm using DNS resolution name.

I had to use WINS name resolution ?

Thanks