ftp://ftp.ai.mit.edu/pub/users/jcma/cl-http/devo/xmactcp-1-7.sea.hqx Contains the latest version of the TCP substrate. Please try it and report successes or problems. Rapid reloading seems to knock over the OpenTransport 1.1 TCP. Mactcp seems to work better. Please send your reports to bug-mac-cl-http@ai.mit.edu We would like to converge next week and issue a revised MAC release.