Adobe Error 105 | Sign-In Blocked? Browser DNS Proxy Fixes

Seeing adobe error 105 can feel random because it shows up in a few different places: Creative Cloud sign-in, app installs, updates, or Acrobat actions that call home. The common thread is simple. Something stops your device from finishing a secure request to Adobe’s servers, or a PDF you’re working with blocks a save or sign step that looks like a network failure.

This guide helps you pin down which version you’re dealing with, then walks through fixes in an order that saves time. Start with the quick match table, follow the step list, then use the prevention checklist so you don’t see the same code again next week.

Adobe Error 105 And What It Means

Error numbers get reused across apps, so treat 105 as a symptom, not a diagnosis. In most Creative Cloud and installer cases, 105 points to a connection or authentication request that didn’t finish. That can be a blocked port, a proxy that needs credentials, a VPN tunnel, a DNS filter, a firewall rule, a broken certificate chain, or a cached sign-in token that went stale.

In Acrobat, 105 sometimes appears when you try to save, sign, or submit a PDF and the file is restricted, damaged, or tied to form tech that doesn’t behave well in certain edit flows. Some PDFs are locked down in a way that makes Acrobat throw a generic “could not be saved / problem reading” style message with a 105 code even when your internet is fine.

Your goal is to sort the problem into one of two buckets. If the app can’t reach Adobe or can’t validate the server, you fix the network path. If the issue happens only with one PDF, you fix the file workflow.

Fast Triage To Pin Down The Cause

Before you reinstall anything, match your exact screen to a likely cause. This saves a lot of trial and error.

Where You See 105	Most Likely Cause	Fast Check
Creative Cloud sign-in loop	Cached token, blocked web login, proxy/VPN	Try a different network or mobile hotspot
Update server connection failure	Firewall, proxy, DNS filter, SSL inspection	Pause VPN and retry the update
Install stuck or retry errors	Corrupted downloads, permissions, network drops	Cancel the install, reboot, try again
Acrobat save/sign “problem reading”	Restricted PDF, form tech glitch, file path issue	Save a local copy, reopen, retry

If switching networks fixes it, your device is fine and your main network is blocking something. If only one PDF triggers it, skip straight to the Acrobat section later in this article.

How To Fix Adobe Error 105 Step By Step

Work through these in order. Stop when the error is gone, then jump to the prevention checklist.

1. Confirm the time and date — A wrong clock can break secure connections and sign-in flows, since certificates rely on correct dates.
2. Restart the app and your device — A clean restart clears stuck background processes and resets network sockets.
3. Try a different network — Use a phone hotspot to test whether your router, ISP filter, or office network is the blocker.
4. Sign out, then sign back in — In Creative Cloud, sign out fully, close the app, reopen it, then sign in again.
5. Clear cached login data — In the Creative Cloud desktop app, clear the stored sign-in data so the next login uses a fresh web session.
6. Update the Creative Cloud desktop app — An outdated client can fail during login and updates, so install the latest Creative Cloud desktop version.
7. Cancel stuck updates and retry — If an update is frozen, cancel it inside Creative Cloud, then start it again so it rebuilds the download.
8. Disable VPN and proxy temporarily — VPN tunnels and authenticated proxies can block Adobe endpoints until the correct settings are in place.
9. Allow ports 80 and 443 — Make sure your firewall or security suite allows standard web traffic out to Adobe servers over HTTP/HTTPS.
10. Reset DNS or switch to a clean resolver — DNS filters can block login hosts, so flush DNS cache and test with a trusted public DNS.
11. Check for SSL inspection — Some networks intercept HTTPS with a local root certificate; if that certificate chain is broken, Adobe requests fail.
12. Run the install as an admin — On Windows, use an administrator account for installs and updates so file writes don’t fail mid-stream.

Where the cached sign-in data lives

Clearing cached login data sounds vague, so here’s what you’re trying to remove: old web cookies, stale tokens, and local identity files that keep sending a bad session back to Adobe. In a browser-based sign-in, clearing cookies for adobe.com can be enough. In the Creative Cloud desktop app, the goal is the same, just stored locally.

• Close background Adobe processes — Quit Creative Cloud, then make sure no Adobe helpers are still running before you clear anything.
• Clear the webview cache — Remove cached web data used by the sign-in window so it loads a fresh login page.
• Restart and sign in once — Open Creative Cloud and complete one clean sign-in before you launch other apps.

If adobe error 105 still shows after these steps, the next move depends on your setup. Home users usually fix it by clearing cached data and removing VPN/proxy friction. Managed devices often need a network admin to allow specific Adobe domains and stop SSL interception for Adobe endpoints.

Fixing Adobe Error 105 On Locked Networks

This section is for office Wi-Fi, schools, hotels, and any network that uses content filtering. These setups can block sign-in pages, activation checks, and update downloads even when normal web browsing works.

Proxy rules and authenticated gateways

If your network uses a proxy that requires a username and password, Creative Cloud may not prompt for those credentials in the right place. You can test this by connecting to a hotspot. If the hotspot works, check your OS proxy settings and disable any forced proxy entries, then retry. If you must use the proxy, ask your IT team for the correct method to whitelist Adobe traffic through it.

Firewall blocks and outbound filtering

Adobe apps rely on standard web ports, mainly 80 and 443, for installs, licensing, and updates. A firewall that only allows a short list of destinations can block those calls. On managed networks, the clean fix is to allow Adobe licensing and update endpoints through the firewall and any web gateway.

DNS filtering and “safe browsing” resolvers

Some routers and DNS services block categories of domains. That’s handy for general web control, but it can break login redirects and token exchanges. Try flushing DNS, then test a different DNS resolver to see if requests complete. If that solves it, keep the resolver that works or adjust the filter policy on your router.

Certificate problems and HTTPS interception

On some networks, traffic is decrypted and re-encrypted for scanning. That process installs a local root certificate on devices. If the certificate is missing, expired, or not trusted, Adobe apps can reject the connection. On macOS, keeping system root certificates current can also matter. If you’re not sure whether inspection is active, test on a hotspot. If the hotspot works, inspection is a prime suspect.

Acrobat And PDF-Specific Triggers

If 105 appears only when working with one document, treat the file as the variable. Many people run into a save or sign error that goes away when the PDF is copied locally or rebuilt.

Restricted or protected forms

Some forms downloaded from the web include restrictions that block saving changes or applying a signature in the way you expect. A simple workaround is to save a copy to your device, close the file, reopen the saved copy, then try the same action again. If the restriction is baked into the form, downloading a fresh copy from the original source can also clear odd behavior.

XFA forms and page extraction workaround

Older dynamic forms built with XFA can trigger reading or save issues inside Acrobat. One practical trick is to extract pages into a new file, then sign and save the rebuilt PDF. This changes the internal structure enough to avoid the glitch in some cases.

Save paths, sync folders, and permissions

Saving directly to a sync folder or a network drive can fail mid-write. Move the file to a local folder like Documents or Desktop, then save. On Windows, check that your user account can write to that folder. On macOS, grant Acrobat access in system privacy settings if it can’t write to certain locations.

Corrupted downloads and partial files

If a PDF was downloaded partway, or was edited by a tool that wrote a messy structure, Acrobat may read it but fail on save. Re-download the file, or ask the sender for a new export. If you have access to the source document, re-export to PDF with a fresh save step.

If you’re updating Acrobat itself and 105 appears during patching, skip the in-app updater and download the full installer from Adobe’s help site. Run it after closing Acrobat and any browsers, then reboot to lock in the new files on the same network.

One-Page Checklist To Stop Error 105 From Returning

Once you’ve cleared 105, a few habits keep it from coming back during the next update cycle or sign-in refresh.

• Keep Creative Cloud current — Install updates for the Creative Cloud desktop app so sign-in and update components stay in sync.
• Use a stable network for installs — Run big downloads on a reliable connection and avoid captive portals that cut off sessions.
• Avoid always-on VPN during updates — Turn VPN back on after installs if you need it for work, but keep it off for patch runs.
• Review proxy settings after travel — Hotel Wi-Fi tools can leave proxy entries behind; clear them when you’re back on your home setup.
• Keep system certificates updated — Run OS updates so root certificates stay current and HTTPS validation works cleanly.
• Save PDFs locally before signing — Work from a local copy, then upload the final file to cloud storage or email.
• Re-download problematic forms — If one form keeps failing, grab a fresh copy and avoid editing the original download.

If you still see Adobe Error 105 after clean network tests and fresh local files, the fastest way to narrow it down is to note where it happens, what network you’re on, and whether a hotspot changes the result. That set of details makes the next troubleshooting step clear.