Open alicecaf locally

ROOT
1

Hello,
I want to connect to alicecaf from my local machine out of CERN via
TProof::Open("zyin@alicecaf.cern.ch");

What I get is the following message:

081115 10:33:16 001 Proofx : XrdProofConn::Init: connection attempt failed: sleep 2 secs
081115 10:33:30 001 Proofx : XrdProofConn::Init: connection attempt failed: sleep 2 secs
081115 10:33:34 001 Proofx : XrdProofConn::Init: connection attempt failed: sleep 2 secs
081115 10:33:38 001 Proofx : XrdProofConn::Init: connection attempt failed: sleep 2 secs

Could you help me out? I have the valid alien-token.

Thank you very much for your kind help.

Best regards,
Zhongbao

2

Hi,

The “alicecaf.cern.ch” machine is not visible from outside CERN directly. You need to open an SSH tunnel via lxplus.cern.ch:

$ ssh -fN4 -L 3000:alicecaf.cern.ch:1093 lxplus.cern.ch
*******************************************************************************
*                    The LXPLUS Public Login Unix Service                     *
* http://cern.ch/ComputingRules : Govern the use of CERN computing facilities *
*******************************************************************************
zyin@lxplus.cern.ch's password:
$

If this operation is successful then ‘alicecaf.cern.ch’ is mapped on port 3000 of your local machine, so you should be able to open a session with the following command:

$root -l
root[] TProof *proof = TProof::Open("localhost:3000")

You can find more details at

root.cern.ch/twiki/bin/view/ROOT/ProofSshTunnel

G. Ganis