Re: [HTCondor-users] Version 23.10.26 and port 3218

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 6/30/2025 11:34 AM, Fienen, Michael N via HTCondor-users wrote:

Hello!

 

We automatically updated to HTCondor Version 23.10.26 late last week. Since then, weâve run into an issue trying to run jupyter notebooks. It would seem disconnected, except for the timing and that a proxy address is now connected to another submit point.

 

The error trying to launch jupyter is this:
 jupyterlab | error adding extension (enabled: True): Unknown scheme for proxy URL URL(â<other_sub_ip>:3128')

 

Itâs suspicious since 3128 seems often reserved for squid proxies? And in this case <other_sub_ip> is the address of the only other submit node in our pool.

 

I just wanted to see if there is a change in default squid-related behavior in this release or another change that might be grabbing that proxy on 3128?

 

Thanks for any ideas.

 

Mike

 

 

    Hi Mike,
    
    So you upgraded from HTCSS v23.10.25 to HTCSS v23.10.26 and now
    trying to launch jupyterlab however you did before no longer works?
    Was your HTCSS upgrade on the access point, execution point, or
    both?  How are you launching jupyterlab.... just doing a
    "condor_submit -i" to get interactive access to an EP slot and then
    running jupyterlab from the shell or?
    
    At first blush, I cannot think of any change in HTCSS v23.10.x that
    would cause this.
    
    As for seeing if something is grabbing port 3128, you could try
    lsof, netstat, or ss to see what process is bound to port 3128.
    
    As for a change in squid related behavior, you could see if the
    environment variable "http[s]_proxy" is set in the context of your
    job.  Ie before launching jupyterlab, try:
     echo "$http_proxy"
     echo "$https_proxy"
    
    Hope the above helps,
    Todd