SSH key authentication issues

[davefrag]

I am running Vshell on a Linux platform.

I have a client that has provided me with their single public key file named "id_dsa.pub" that appears to contain 3 keys. I'll call those keys USR1@host1, USR2@host1 and USR3@host1. I've placed that file in that clients /.vshell/publickey directory.

When the client attempts to make an SFTP connection while logged into the "USR3@host1" account on their remote system, the connection works. When the client attempts to make an SFTP connection while logged into either "USR1@host1" or "USR2@host1" accounts on their system, key authentication fails.

The remote user attempting to establish the connection is receiving the following messages when the connection attempy fails:

debug1: Next authentication method: publickey
debug1: Trying private key: /client/u/usr1//.ssh/id_rsa
debug3: no such identity: /client/u/usr1//.ssh/id_rsa
debug1: Trying private key: /client/u/usr1//.ssh/id_dsa
debug3: no such identity: /client/u/usr1//.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password

Since this issue is becoming very frustrating to say the least, any and all assistance is appreciated.