ssh freezes when trying to connect to some hosts

Question

When I try to ssh to particular machine/s in a list, The SSH command happens to be freezing. I tried out setting ssh timeout. But then also it's freezes even after the timeout.

In verbose mode :

OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to x358.x.server.com [10.x.x.x] port 22.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: identity file /export/home/sqlrpt/.ssh/identity type -1
debug1: identity file /export/home/sqlrpt/.ssh/id_rsa type -1
debug1: identity file /export/home/sqlrpt/.ssh/id_dsa type 2

At this point it freezes.

A work around I thought was to create a child process for each ssh calls and if the process doesn't respond after a timeout - Kill it. But are there any less complex ways, so that I can accommodate it in a shell script itself rather than going for a C/C++ program ?

Solution

ssh -2 -o ConnectTimeout=5

This did the trick. It's no more getting stuck

Comments

[D_Bye]

Try running the ssh command with -vv or even -vvv to increase verbosity - you might get more information that way.

[glglgl]

Programming question or admin question?

[Spiff]

Why such ancient versions of OpenSSH & OpenSSL?

[Wattholm]

Can't help it much as they are managed by a different colo. and the only way is just to go with this :|

[Wattholm]

can you make it more clear? What really is the work around ?