Internal Server Error @ mailman.nanog.org

[nanog () fleish org]

I am unable to login to the mailman web interface & manage my subscription options @ 
https://mailman.nanog.org/mailman/listinfo/nanog. I get the below Internal Server Error 500 response:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@localhost to inform them of the time this error occurred, and the 
actions you performed just before this error.
More information about this error may be available in the server error log.
Apache/2.4.18 (Ubuntu) Server at mailman.nanog.org Port 443

If an admin could look into this I’d appreciate it.

-T