Magento 2.4 Error flushing Varnish server. Host: "127.0.0.1". PURGE response code: 405 message: Not Allowed after running upgrade command

Question

I enabled varnish cache from admin(magento 2.4), then I ran this command

bin/magento setup:config:set --http-cache-hosts=127.0.0.1

Now I can't run the upgrade script. I'm getting this error:

Error flushing Varnish server. Host: "127.0.0.1". PURGE response code: 405 message: Not Allowed
Server: nginx/1.18.0 (Ubuntu)

I have not changed anything in /etc/varnish/default.vcl and in /etc/default/varnish

Any kind of help would be appreciated

Answer 1

The problem is related to the purging ACL in your VCL file. Apparently the client IP doesn't match any IP address in the ACL.

This somewhat makes sense, because Varnish doesn't receive the actual client IP address, because Nginx is jammed in between as a TLS proxy.

Please share your full VCL file, including the purging ACL.

Potential solutions

1. Modify the VCL to use the value of the X-Forwarded-For header instead of client.ip
2. Add the port of Varnish server to the IP address of your --http-cache-hosts parameter.

The 2nd solution is probably the easiest one because it doesn't require a lot of effort. If Varnish runs on port 6081 for example, your config command could look like this:

bin/magento setup:config:set --http-cache-hosts=127.0.0.1:6081

This will ensure that Varnish receives the purges directly, rather than through ports 80 or 8080 that are configured by Nginx.

See https://devdocs.magento.com/guides/v2.4/config-guide/varnish/use-varnish-cache.html for more information.