Will modification of configuration via the GUI Configuration Utility break existing connections?

this is deleting configuration test.

 config

root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:23
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        tcp { }
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 50
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:23 {
            address 200.200.200.101
        }
    }
}

 test

[root@ve11a:Active:In Sync] config  date; tmsh show sys connection cs-server-port 23
Sun Jul  6 17:11:05 PDT 2014
Sys::Connections
172.18.204.230:49184  172.28.24.10:23  200.200.200.14:49184  200.200.200.101:23  tcp  30  (tmm: 1)  none
Total records returned: 1

[root@ve11a:Active:In Sync] config  date; tmsh delete ltm virtual bar
Sun Jul  6 17:11:47 PDT 2014

[root@ve11a:Active:In Sync] config  date; tmsh show sys connection cs-server-port 23
Sun Jul  6 17:11:52 PDT 2014
Sys::Connections
172.18.204.230:49184  172.28.24.10:23  200.200.200.14:49184  200.200.200.101:23  tcp  2  (tmm: 1)  none
Total records returned: 1

[root@ve11a:Active:In Sync] config  tcpdump -nni 0.0 -s0 -c 10 port 23
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:12:20.398431 IP 200.200.200.101.23 > 200.200.200.14.49184: . 242977700:242979160(1460) ack 1485839933 win 5840 in slot1/tmm1 lis=/Common/bar
17:12:20.398444 IP 200.200.200.101.23 > 200.200.200.14.49184: P 1460:2062(602) ack 1 win 5840 in slot1/tmm1 lis=/Common/bar
17:12:20.398460 IP 172.28.24.10.23 > 172.18.204.230.49184: P 3965833330:3965834790(1460) ack 56076194 win 4210 out slot1/tmm1 lis=/Common/bar
17:12:20.398467 IP 172.28.24.10.23 > 172.18.204.230.49184: P 1460:2062(602) ack 1 win 4210 out slot1/tmm1 lis=/Common/bar
17:12:20.398471 IP 200.200.200.14.49184 > 200.200.200.101.23: . ack 2062 win 48955 out slot1/tmm1 lis=/Common/bar
17:12:20.400144 IP 200.200.200.101.23 > 200.200.200.14.49184: P 2062:3040(978) ack 1 win 5840 in slot1/tmm1 lis=/Common/bar
17:12:20.400158 IP 172.28.24.10.23 > 172.18.204.230.49184: P 2062:3040(978) ack 1 win 4210 out slot1/tmm1 lis=/Common/bar
17:12:20.400161 IP 200.200.200.14.49184 > 200.200.200.101.23: . ack 3040 win 49933 out slot1/tmm1 lis=/Common/bar
17:12:20.411946 IP 172.18.204.230.49184 > 172.28.24.10.23: . ack 1460 win 64437 in slot1/tmm1 lis=/Common/bar
17:12:20.411956 IP 172.18.204.230.49184 > 172.28.24.10.23: . ack 3040 win 64437 in slot1/tmm1 lis=/Common/bar