You have been subscribed to a public bug:
ssh-add seems not to work with the confirmation (-c) option. Trying to
require that identities be subject to confirmation when used brings up
the error "Error reading response length from authentication socket. "
$ ssh-add -c /home/user/.ssh/key_rsa
Enter passphrase for /home/user/.ssh/key_rsa:
Error reading response length from authentication socket.
Could not add identity: /home/user/.ssh/key_rsa
Addding keys not subject to confirmation when used works as normal:
$ ssh-add /home/user/.ssh/key_rsa
Enter passphrase for /home/user/.ssh/key_rsa:
Identity added: /home/user/.ssh/key_rsa (/home/user/.ssh/key_rsa)
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: openssh-client 1:6.0p1-3ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Tue Oct 16 13:55:08 2012
InstallationMedia: Lubuntu 12.10 "Quantal Quetzal" - Release amd64+mac
(20121015)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
RelatedPackageVersions:
ssh-askpass N/A
libpam-ssh N/A
keychain N/A
ssh-askpass-gnome N/A
SSHClientVersion: OpenSSH_6.0p1 Debian-3ubuntu1, OpenSSL 1.0.1c 10 May 2012
SourcePackage: openssh
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-keyring (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal
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ssh-add: Error reading response length from authentication socket.
https://bugs.launchpad.net/bugs/1067301
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