BTW, this is the civ network log of our connection attempt.
It looks like the IP of the server is resolved and a contact with the pitboss app is established but our civ client is not satisfied with the connection to the pitboss application itself .
Maybe helpful for you..
[6079.187] DBG: Resetting the portal! (m_bConnectComplete=false)
[6083.695] DBG: Resetting the portal! (m_bConnectComplete=false)
[6084.101] WRN: Disconnecting from entire Peer Network!
[6092.541] DBG: Attempting to join host at determined address caledorn.no-ip.org:2056
[6094.413] DBG: Adding pending connection-level player info for NetID 0
[6094.413] DBG: Setting NetID 0 PUBLIC address to 178.17.156.44:2056
[6094.413] DBG: Connected to the host!
[6094.631] DBG: Setting our local RandID to 1843157587.
[6094.631] DBG: Received welcome from host.
[6094.631] DBG: Setting NetID 0 PRIVATE address to 10.0.1.20:2056
[6094.631] DBG: Adding active connection-level player info for NetID 1
[6094.631] DBG: Setting NetID 1 PUBLIC address to 79.196.25.21
[6094.631] DBG: Setting NetID 1 PRIVATE address to 192.168.178.25:2056
[6094.631] DBG: Got our peer complete message!
[6094.631] DBG: Adding NetID 0 to Portal!
[6094.647] DBG: Adding NetID 1 to Portal!
[6094.678] DBG: Got NetworkReady from NetID 1
[6094.678] WRN: Not responding to NetID 1 NetworkReady (state == INIT_SENT_READY)
[6094.678] DBG: Checking if we're connect complete! PeersReady=no :: AlreadyComplete=no
[6114.973] DBG: Resetting the portal! (m_bConnectComplete=false)
[6114.973] WRN: Cleaning up MP Layer - closing connection to Net ID 0
[6114.973] DBG: Closing the connection for NetID 0! Connection State = 1!
[6114.973] DBG: Removing connection-level player info for NetID 0 (state=2)
[6114.973] WRN: Cleaning up MP Layer - closing connection to Net ID 1
[6114.973] DBG: Removing connection-level player info for NetID 1 (state=2)
[6115.535] WRN: Disconnecting from entire Peer Network!
[6118.140] WRN: Disconnecting from entire Peer Network!
Advice: use the microsoft method first, reboot system

Maybe some invalid state due to your ISP problems ?