Problem using SOAP Monitor : SoapUI Pro 2.5.1

I am trying to monitor traffic to following service endpoint

http://someserver/some_Service_1.0/services/soap

So last evening I started SOAP Monitor using following options

HTTP Tunnel
Port: 80
end point for http tunnel: http://someserver/some_Service_1.0/services/soap

I have two problems with it

1) It captured traffic initiated from my SoapUI client (on which Monitor is running) to above server. But it did not capture traffic initiated from my colleuges SoapUI client.

2) Today morning I started Soap Monitor with same options, now it does not even capture traffic initiated from my SoapUI client (on which Monitor is running)

I am stuck at this point

thanks