Stuck for 2 weeks on diskless client

I have signed up with 5 different forums. None of them seemed active. I haven't gotten a single answer. I'm going to try to explain as best as I can what my problem is. I am new to linux and I am using Solaris 10 (newest update).
I am attempting to make a diskless client. Here are the settings:
ultramain: this is the OS server (Ultra 60). Everything is set correctly. I have checked ethers, hosts, and all other files relating to diskless booting.
ip: 120.3.2.250
broadcast: 120.3.2.255
netmask: 255.255.255.0
sf3800-up: this is the system controller of the client
ip: 120.3.2.41
gateway: 120.3.2.250
netmask: 255.255.255.0
the client is a sun fire 3800.
It is called sf3800-a in the /etc/hosts file.
The mac address is right in the ethers file.
I am attempting to boot up sf3800-a through telnet.
I have a hub. One ethernet cable goes from ultaserver to the hub, an other from the system controller to the hub, and an other one from sf3800-a to the hub.
I telnet the system controller fine. I access the console and run show-nets.
I proceed to boot. It finds the ip address fine. Cursor rotates for a while and it just stops. Cursor becomes blank and just flashes. I have snooped from the OS server. Everything loads up fine at first. All tftp data blocks load up fine. Then the client tries to get an ip for the OS server and finds it okay. It freezes on this line:
"sf3800-a -> ultraserver SYSLOG R port=32801".
After around 30 mins it goes through 2 more lines in snoop:
"120.3.2.41 -> ultraserver Telnet R port=32817 Using RARP/BOOTPARAMS"
"ultraserver -> 120.3.2.41 Telnet C port=32817".
I also tried to verbose the boot.
It freezes here:
"Found 120.3.2.250 @ 8:0:20:c3:a7:65"
I also have used in.rarp in debug mode. It finds the addresses find.
Now here's the real puzzling thing. I can get out of this hang mode by pinging the client (120.3.2.50) from the ultraserver. Right after that, the cursor starts spinning again and everything boots up fine.
WTF is the problem? I've searched to no ends. I reinstalled Solaris many times from different ISO's. I have switched the ethernet cables. I have changed memory. Changed hubs. Checked every files. Re-done smosservice + smdiskless. Stopped and restarted the daemon services over and over again.
I just started with this. I have never used Solaris. Only windows. I know I'm missing something really easy. I was thinking that the addresses are maybe not setup right? I also don't have a defaultrouter address in /etc. I doubt that could cause a problem.
Please, I beg you. Help me. Help a out.
PS:
I have left the system while it was hung over night. This morning, it did load up. Is there a way to diagnose which file it is getting stuck on?

I think that the situation is different, depending on whether your broadband was supplied via cable, or a separate phone line. I believe that some parts of the cable network are still analogue, so a separate copper pair is needed for phone and broadband.
In the latter case, then a MAC code would be needed, for BT to release the "tag" on the line.
It should not be needed on a cable service, if the phone and broadband come down the cable, as BT have no involvement.
If you are in that category, then you should have specified that you did not have a BT phone line, or broadband. You would not have needed a MAC code.
What category were you in?
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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Certificate: Juniper Networks, Inc.
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Product Name: Juniper Setup Client
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http://blogs.technet.com/b/askpfeplat/archive/2013/03/22/troubleshooting-windows-performance-issues-using-the-windows-performance-recorder.aspx
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Stuck for 2 weeks on diskless client

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