Some common questions, errors, and problems are categorized below. Click the Expand Topics link in the upper right to see all entries at once. You can also use the search box above to search the user guide for any issues you are seeing.

About Hammer
    Can you remove me from the Hammer mailing list?
    How is Hammer different than other Community Clusters?
    Do I need to do anything to my firewall to access Hammer?

Logging In & Accounts
    Errors
        /usr/bin/xauth: error in locking authority file
        My SSH connection hangs

    Questions
        I worked on Hammer after I graduated/left Purdue, but can not access it anymore


Jobs
    Errors
        cannot connect to X server / cannot open display
        bash: command not found
        qdel: Server could not connect to MOM 12345.hammer-adm.rcac.purdue.edu
        bash: module command not found
        close Firefox / Firefox is already running but not responding
        1234.hammer-adm.rcac.purdue.edu.SC: line 12: 12345 Killed

    Questions
        How do I check my job output while it is running?
        What is the "debug" queue?
        How can I get email alerts about my PBS job status?
        Can I extend the walltime on a PBS job?
        How do I know Non-uniform Memory Access (NUMA) layout on Hammer?


Data
    My scratch files were purged. Can I retrieve them?
    How is my Data Secured on Hammer?
    Can I share data with outside collaborators?
    Can I access Fortress from Hammer?

Software
    Cannot use pip after loading ml-toolkit modules
    How can I get access to Sentaurus software?

About Research Computing
    Can I get a private server from RCAC?