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Recently, the JET data access procedure was modified and additional configuration of the user environment is required on the Gateway(in addition to the steps described described by CODAS).
The users on the Gateway need to do the following:
Open or create the file $HOME/.ssh/config and put the following lines there:
Host mdsplus.jetdata.eu
User user_name
IdentityFile key_name
Here 'user_name' is your username at JET (not on the Gateway) and 'key_name' is the name of the file with public SSH key (without .pub extension) you sent to the CODAS.
After this step the tools to fetch data from JET using exp2itm should work as before.