incomplete URL path - Nginx, multisite, subdomain

This is a really frustrating one.

I have setup a nginx fastCGI server (debian), with a multisite install. All kind of works, however:

Essentially wordpress URL paths are incorrect for links that are on the front-end of a website, they just redirect to the current page, it does not add the url extension required (i.e. “my account” link for a woocommerce link or similar) and on the backend theme/plugin activation links are wrong. There are bits missing out of the URL path.

For example, where the URL should be:
I get:

Which is incorrect and results with a permission issue.

Another example, what should be: (selectable from side menu) has a link from the dashboard of:

As you can see it is stripping the full URL path.

I thought this may be plugins themes etc. so I disabled everything and tried, then removed everything and tried, no avail.

Then thinking it is likely FastCGI, Nginx or similar, I went about setting up a completely separate server, with a different LEMP configuration and nothing on it. Once again, the same has occurred.

Having tried too many times to count, crashing both servers several time and 2 days of Google’ing I have given up.

I’m hoping someone here could help point me in the right direction?

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Without knowing more about how Nginx was configured in this instance, it is hard to give a thorough answer. WordPress has an extensive article on configuring Nginx, including a section with a sample configuration file specifically for setting up multi-site. If you are using WP Super Cache or W3 Total Cache, there are also samples for multi-site configuration there. The team at Nginx also provides a sample configuration for WordPress multi-site.

Hope that points you in the right direction!