I experiences issues trying to get rootd working at CCALI. I could contact the user support but I couldn’t find any help googling on these error messages so I think anyway this topic may be helpful for others.
I am willing to access remotely to some rootfiles which are hosted on a CCALI (CCIN2P3, Lyon) machine. So I log into the CCALI machine and type
which seems to work. However, trying to access a file lead to the following errors :
$ root -l
root  TFile *f = TFile::Open("root://ccali26.in2p3.fr:5151/path/to/my/rootfile.root","new")
Error in <TXNetSystem::Connect>: some severe error occurred while opening the connection at root://ccali26.in2p3.fr:5151/path/to/my/rootfile.root - exit
Error in <TXNetSystem::TXNetSystem>: fatal error: connection creation failed.
Error in <TXNetFile::CreateXClient>: open attempt failed on root://ccali26.in2p3.fr:5151/path/to/my/rootfile.root
Should I understand that CCALI forbids the use of rootd ?
Edit : After some tests on another (non CCALI) machine I figured out that this error occurs when you try to connect to a port where rootd is not listening or when the port where rootd is listening is filtered by the router. I guess this is what happens here.
Maybe these error messages could be make a bit more clear about that.