Discussion on:

Query for GNS 3 users

Well i
I downloaded the GNS 3 package to study for CCNP, it launches fine. I can actually configure routers 1 and sometimes router 2, the only question I have is.
Why does it loose connection with the default server and never reappear? The message I get are
Router 1 connection lost with 127.0.0.1:7200
Router 2 connection lost with 127.0.0.1:7200
Router 3 connection lost with 127.0.0.1:7200
I believe these are the pre-established IP and port addresses for the software, I have asked for clarification of this problem from the GNS 3 team, but I am still awaiting an answer. It does not matter how many times I uninstall and re-install it I still get the same messages when I try to run it. Anybody got any ideas out there as to how to resolve this matter?

What OS?

Sometimes personal firewall applications or anti-virus apps interfere with applications that establish their own connections.

Windows has some features such as dead-gateway-detection that disables interfaces with invalid gateways.

Are you running the app with administrator level access (runas administratrator).