Hello I have upgraded Koha 16.11 to 20.05, on Ubuntu 18.04 with Mariadb 10.4. Everything is fine but Koha stops working sometime with the below error, however some network related work is going on in our computer center where Koha server is managed by them. All the applications are working like institute website, library website, etc. but only Koha is having the problem below. May I know if this is a Koha related issue or any network issue? The proxy server received an invalid response from an upstream server. The proxy server could not handle the request Reason: Error reading from remote server Apache/2.4.29 (Ubuntu) Server at 192.168.1.134 Port 80 With Regards, Vinod Kumar Mishra, Assistant Librarian, Biju Patnaik Central Library (BPCL), NIT Rourkela, Sundergadh-769008, Odisha, India. Mob:91+9439420860 URL: http://vinod.itshelp.co.in/ ORCID ID: http://orcid.org/0000-0003-4666-7874 *"Spiritual relationship is far more precious than physical. Physical relationship divorced from spiritual is body without soul" -- Mahatma Gandhi*