Access to Sharecloudy is denied while the rest of the web functions normally rarely points to a server-side issue. We observe that the majority of blocks come from network layers or security settings that are invisible to the user, well upstream of the browser.
Private DNS and encrypted DNS profiles: the hidden cause of Sharecloudy blocks
The first reflex when Sharecloudy refuses the connection should not be to clear the browser cache. Private DNS is the first layer to check, especially on mobile.
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On Android, the private DNS setting (accessible in Settings > Network & Internet > Private DNS) can prevent the resolution of the Sharecloudy domain if the configured encrypted DNS server does not recognize the domain or applies filtering. The test is simple: temporarily switch this setting to “Off” and try to access again.
On iPhone, the mechanism is different but the result is the same. A DNS profile installed in Settings > VPN & Device Management can redirect all DNS queries to a third-party resolver that blocks certain cloud domains. An active VPN in the background produces the same effect without visible notification.
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For those looking to resolve the connection issue on Sharecloudy, we recommend starting with this check before any other actions.
If access returns after disabling private DNS, the problem is confirmed. Two options are then available: change the DNS resolver (switch from Cloudflare to Google Public DNS, or vice versa) or add an exception if the DNS client allows it.
HSTS and browser security cache: why clearing the standard cache is not enough
The HSTS cache is distinct from the standard browsing cache. Clearing temporary files and cookies does not reset it.
HSTS (HTTP Strict Transport Security) forces the browser to contact a domain only over HTTPS. If a corrupted or expired HSTS entry persists for the Sharecloudy domain, the browser will refuse the connection with an error like ERR_CONNECTION_REFUSED or a message indicating that the site does not allow the connection, without further explanation.
Clearing the HSTS cache in Chrome
Access chrome://net-internals/#hsts in the address bar. In the “Delete domain security policies” section, enter the exact domain of Sharecloudy and then click Delete. Close and reopen the browser.
On Firefox, the procedure involves deleting the SiteSecurityServiceState.txt file in the profile folder. On Safari, only a complete clearing of the history resets the HSTS policies.
This diagnosis explains a common scenario: the site works in one browser but not in another on the same device. If Chrome blocks and Firefox does not, it is Chrome’s HSTS cache that is problematic, not the network.
Operator filtering and network firewall: when Sharecloudy works elsewhere but not at your location
A determining test is to switch to a mobile network (tethering from a smartphone) or to activate a VPN. If Sharecloudy becomes accessible via another network, the block comes from your local infrastructure or your operator.
Operator filters and transparent proxy
Some ISPs apply DNS filters or transparent proxies that intercept requests to cloud domains considered uncategorized. A corporate proxy can also block access if the domain is not on its whitelist.
- Check if a proxy is configured in the network settings of the operating system (Proxy settings on Windows, Network preferences on macOS). An active proxy that you did not configure yourself indicates network filtering.
- Test with another public DNS by manually forcing the DNS servers in your network adapter or router configuration. Google Public DNS and Quad9 are the most common alternatives.
- Check the rules of the local firewall. A Windows firewall or third-party security software may block outgoing connections to certain ports or domains without notification.
Structured network diagnosis
We recommend a methodical verification chain rather than random attempts:
- DNS: disable private DNS or change the resolver, then retest.
- HSTS cache: clear the domain entry in the affected browser.
- Proxy and firewall: check system configuration and temporarily disable third-party firewall.
- Alternative network: test via mobile tethering or a VPN to isolate the problem.
ERR_CONNECTION_REFUSED error and unauthorized connection message on Sharecloudy
The message “this site does not allow the connection” or the ERR_CONNECTION_REFUSED error in Chrome are often interpreted as a server problem. In most cases, it is an intermediate layer that rejects the request before it reaches the server.
When the server itself is at fault, the returned error is usually an HTTP 5xx code (502, 503). An ERR_CONNECTION_REFUSED indicates that the TCP connection failed, which points to a network block, a firewall, or a DNS resolution issue.
To differentiate between the two situations: open a terminal and run a ping or traceroute command to the Sharecloudy domain. If the ping does not resolve the IP address, the problem is DNS. If the ping succeeds but the HTTPS connection fails, it is a port block or proxy interception.
The reflex to change browsers or clear the standard cache remains relevant as a first step, but it only resolves a fraction of cases. The majority of persistent blocks lie between private DNS, HSTS cache, and network filtering, three layers that classic troubleshooting guides rarely address in this order.