Remote server connectivity error on replaying thick client application vugen script

I tried recording a desktop application (Kofax capture 10.0) scan module using virtual user generator 11.04

Kofax uses the below protocols:

HTTP/HTTPS

UDP - License checking

The recorded script is in attached document.

When I replay the script am getting errors.

Recording log ERROR:

[Net An. Warning  (27e0:13d8)] Request Connection: Remote Server @ 0.0.0.0:2424 (Service=?) Failed attempt #1. Unable to connect to remote server: rc = -1 , le = 0)

[Net An. Warning  (27e0:13d8)] Request Connection: Remote Server @ 0.0.0.0:2424 (Service=?) Failed attempt #2. Unable to connect to remote server: rc = -1 , le = 0)

[Net An. Warning  (27e0:13d8)] Request Connection: Remote Server @ 0.0.0.0:2424 (Service=?) Failed attempt #3. Unable to connect to remote server: rc = -1 , le = 0)

[Net An. Error    (27e0:13d8)] Request Connection: Remote Server @ 0.0.0.0:2424   (Service=?)  NOT PROXIED! (REASON: Unable to connect to remote server: rc = -1 , le = 0)

Replay log error:

Action.c(340): Error -26612: HTTP Status-Code=500 (Internal Server Error) for "http://localhost:2424/BatchNotificationService"              [MsgId: MERR-26612]

Action.c(340): web_custom_request("BatchNotificationService") highest severity level was "ERROR", 2227 body bytes, 180 header bytes     [MsgId: MMSG-26388]

Please help me in resolving the issue.

Also please guide me which protocol to select