Using ssh -t works but using ProxyCommand ssh -W does not

I am trying to set up a ssh connection through a jump host. It should go like this A -> B -> C. I can connect fine from A to B and from B to C but I would like to have a single connection from A to C directly (I want to use some tools over ssh.) I'm on mac OSx. These command work fine: ssh hostB and then from hostB ssh hostC or ssh -t hostB ssh hostC I am able to get on hostC. I have another tunnel set up to a cluster and it works fine. ssh cluster This is my .ssh/config file: Host hostB Hostname xxx.xxx.xxx.xxx User userB ForwardAgent yes IdentityFile ~/.ssh/id_rsa_macbook_air Host cluster Hostname clusterHostname User clusterUser ProxyCommand ssh hostB -W %h:%p IdentityFile ~/.ssh/id_rsa Host hostC Hostname xxx.xxx.xxx.xxx User userC ProxyCommand ssh hostB -W %h:%p IdentityFile ~/.ssh/id_rsa_macbook_air Host *+* ProxyCommand ssh -W $(echo %h | sed 's/^.*+//;s/^\([^:]*$\)/\1:22/') $(echo %h | sed 's/+[^+]*$//;s/\([^+%%]*\)%%\([^+]*\)$/\2 -l \1/;s/:\([^:+]*\)$/ -p \1/') I get the following error when I try to connect to hostC: ssh hostC -v OpenSSH_6.9p1, LibreSSL 2.1.8 debug1: Reading configuration data /Users/userC/.ssh/config debug1: /Users/userC/.ssh/config line 28: Applying options for hostC debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 21: Applying options for * debug1: /etc/ssh/ssh_config line 56: Applying options for * debug1: Executing proxy command: exec ssh hostB -W xxx.xxx.xxx.xxx:22 debug1: permanently_drop_suid: 501 debug1: identity file /Users/userC/.ssh/id_rsa_macbook_air type 1 debug1: key_load_public: No such file or directory debug1: identity file /Users/userC/.ssh/id_rsa_macbook_air-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.9 channel 0: open failed: administratively prohibited: open failed stdio forwarding failed ssh_exchange_identification: Connection closed by remote host I get the same output when I run: ssh -l userC userB%hostB+hostC I don't have and cannot install netcat or any other software on hostB. I have full access on my start machine and on hostC. Thank you for your help!