I am guessing that you are using subdomains instead of sub folders for your multisite set up? This is an issue that appears to happen when using subdomains and setting up your multisite manually.
I recall this issue happening with WordPress MU a bit ago and it was related to cookies or something and you simply had to add some cookie settings to your config file. Because multisites are WordPress MU basically, I wonder if that’s the issue.
Try this comment posted on the WordPress support forums. This question on WordPress answers looks similar, does this help as well?
Related Posts:
- Is there a is_user_logged_in() for multisite?
- Unable to login to new custom domain on multisite?
- share login/logout sessions across two installs?
- How to Login Once to an Entire WP Multisite Network
- Multisite – Redirect All Users to Subsite Home Page on Subsite Login
- WordPress Multisite Login Access
- Subdomain login problems
- WordPress Multisite local: wp-login.php refreshes on login Chrome Browser
- ‘Remote Login’ with MultiSite Domain Mapping still forcing users to login to all blogs individually?
- How to stay logged in on a multisite with different domains?
- Login on Multiple Sub-Domains without Multisite
- Auto Redirect after login
- WordPress MultiSite login to the respective site
- How to fix blocked cookies error that doesn’t let me log into wp-admin?
- Good way to block users within a multisite setup without deleting them?
- Automatically login user across multisite
- How can you override the is_multisite check in wp-login.php for individual login/registration?
- How to write RewriteRule for login in multisite
- Multisite Login problem
- Https and Http Login Issue on WordPress Multisite
- Different Domains in Multisite Setup
- Multisite infinite redirect loop
- Disable site visiting and user logins excepting for a specific user
- Infamous admin login redirect
- Is there something I need to know in order to use WordPress on foreign (Swedish) TLDs?
- Restrict users of site 1 to login in site 2 in wordpress multisite
- Unable to execute Ajax request, status code 400
- How to display custom logo on WordPress login page
- Moving from a non WordPress site to a WordPress Site – Login between both sites
- WordPress Multisite: Login to all subsites at once
- Multisite – site user limited only for this site
- Unable to sign in to network after moveing address but able to login into child sites
- User not staying logged into one of sub sites in multisite after SSL
- Single sign on to sub-sites in Multisite Network
- WordPress automatic Login on other page?
- how to make a cronjob run, when user needs to be logged in
- WordPress Network with SSL for multiple domains
- Why does this multisite redirection loop vanish when I add “www.”?
- One login for 3 WordPress installations with combined user table doesn’t work
- Multisite: Redirect Subsite Administrator to Subsite Home Page, Bypassing Dashboard
- Admin user getting redirected to /wp-admin/user
- How to login a user with wp_set_auth_cookie on a specific blog within a multisite environment
- Is it possible to create a login for restricted visibility?
- How do I combine wp_redirect and add_filter?
- Some Subdomains on a Multisite Install Not Found
- Common login for websites belonging in different networks
- Best Way to Setup a Network of WP Sites?
- WordPress Multisite restict user access
- Error Message when logging into WordPress on Xampp
- WordPress MU: Cookie error when trying to login on network WP instance
- something in database is causing me to not be able to log into network admin of multisite
- Why am I getting the login screen in wp-admin->Appearance->Customize?
- Keep users logged in across multisite in wordpress (for various domains)
- How to use WordPress Multisite With Different Domain Names?
- How To Add Custom Form Fields To The User Profile Page?
- Where are available Roles Defined in the wp_ database?
- restore_current_blog() vs switch_to_blog()
- Can i merge 2 new WP_Query($variable) ‘s?
- How to disable a network enabled plugin for just one site?
- How to reliably flush rewrite rules on multisite?
- Site Redirecting to wp-signup.php
- Moving a WP Multisite to a subdirectory
- Cookies in multisite where network sites have their own domain name
- Convert a Multisite WordPress install into a Single site
- WordPress MultiSite Active Directory integration and site privacy
- WordPress Job Interview Preparation
- How to add Custom Blog Options to new blog setup form?
- How can I trust switch_to_blog()?
- Remove the blog slug from WordPress Multisite root node
- Why are my roles not visible in a Multi-site/Network?
- Site admin in a network install can’t edit users?
- How to use same email for multiple users
- How to run an activation function when plugin is network activated on multisite?
- Specific upload folder for PDFs in custom Post type in WP multisite
- What is the correct way to map multiple domains in a WordPress 4.1 multisite install?
- Where can I find documentation on what characters are allowed in user names and why?
- How to migrate subsite from dev multisite to production multisite
- How can I un-reserve a pending username registration?
- How do I remove/delete an old super admin user?
- DB connection error after copying a WordPress Multisite instance to a second location
- Redirect Main Site to Subsite in Multisite WordPress
- Switching MultiSite installation from HTTP to HTTPS
- Allow user to select a theme to install when they signup
- Setting up a wordpress network with third level domains
- Get upload URL by blog ID in multisite
- What’s the difference between get_site_option and get_blog_option?
- Need help sorting “My Sites” Alphabetically
- How to delete post revisions?
- Create mobile site with same content just different theme
- Add additional Network constants to wp-config.php dynamically
- Multisite stuck at 1MB for max file size
- How to get blog name, when using WordPress Multisite
- What are options are there to implement a multi language site
- Switching primary site in WordPress Multisite
- Multisite Network Port Num Issues?
- Convert existing site to network
- Where is the robots.txt stored for a WordPress Multisite install?
- Settings API in Multisite – Missing update message
- Add WordPress MU Network Admin via Database
- How to get current site id? (WPMU)