Most Costco website access issues stem from local browser problems, not server outages. Start by checking if the site is actually down using DownDetector or IsItDownRightNow—if thousands of others report problems, it's on Costco's end and you just wait. If it's only you, the fix is usually straightforward. Clear your browser cache and cookies first. Costco's site uses heavy session tracking and shopping cart cookies that can corrupt. In Chrome or Firefox, go to Settings > Privacy > Clear browsing data, select cached images and cookies, then reload. This fixes roughly 60% of access problems we see clients report. VPN and ad blocker conflicts are common. Costco's checkout and membership verification systems sometimes block requests from VPN IP addresses or aggressive content blockers. Disable your VPN temporarily and whitelist Costco in uBlock Origin or similar tools. Corporate networks and public WiFi also occasionally block retail sites—test on your phone's data connection to rule that out. Browser compatibility matters more than you'd think. Costco's site works best on updated Chrome, Safari, Edge, or Firefox. If you're on an outdated browser version or something niche, update it or switch. Try incognito mode to rule out extension conflicts. For Canadian users specifically: make sure you're on Costco.ca, not .com, if you need Canadian pricing and inventory. The sites are separate and .com sometimes restricts Canadian IP addresses from certain features. Conversely, if you're accessing .com from Canada for cross-border shopping, use a US-based VPN. If none of this works, check your firewall or antivirus software—overzealous security tools sometimes flag retail checkout flows as suspicious. Temporarily disable them to test. At Ottawa SEO, when clients report similar issues with ecommerce sites we've built, we find the problem is local configuration about 85% of the time. Only when multiple users across different networks can't access do we investigate hosting or DNS issues. For Costco specifically, their infrastructure is solid, so assume it's your setup until proven otherwise.