Loop in redirect

FAJUMO Without seeing the iRule that you have configured or knowing if you have a pool associated to the virtual server, the following iRule might work but I would definitely provide your iRule configuration and virtual server configuration so we can make sure that this iRule I provided will work for you.

when CLIENT_ACCEPTED priority 500 {

    set DEFAULT_POOL [LB::server pool]

}

when HTTP_REQUEST priority 500 {

    set HOST [HTTP::host]

    if { ${HOST} eq "www.abc.com"} {
        HTTP::redirect "https://abc.com/niiverify"
    } else {
        pool ${DEFAULT_POOL}
    }

}