What you’re seeing
- Mapping the library to a drive letter fails with a network path or access error.
- The mapped drive connects in the morning but disconnects or asks for credentials again later in the day.
- Explorer shows the SharePoint drive as empty or extremely slow to browse.
- Large files fail to save to the mapped drive even though they upload fine in the browser.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- Mapping a library as a drive relies on the legacy WebDAV protocol, which Microsoft has deprecated and does not design for modern authentication.
- The WebClient service that handles WebDAV connections is stopped or not installed, especially on Windows Server.
- Modern sign-in and MFA tokens are not passed to WebDAV the way the browser receives them, so sessions expire and the drive drops.
- Built-in WebDAV file size limits block uploads of large files.
- The site is not trusted by the browser security zones that Windows uses for WebDAV authentication.
Why it matters
Mapped drives feel familiar, so many offices try to keep a drive letter after moving to SharePoint. When the connection keeps failing, people lose unsaved work, save files locally instead, or keep using the old server, which splits data across two places. Line-of-business programs that expect a drive letter may break entirely, holding up the migration and leaving the business paying for both old and new storage.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Can we keep using a drive letter at all?
There are better-supported ways to give people a familiar File Explorer experience with SharePoint than a WebDAV drive mapping. An engineer can explain the options and which fits your applications.
Why does it work for some people and not others?
WebDAV depends on per-PC services, browser trust settings and how recently someone signed in, so results vary from machine to machine. That inconsistency is one reason it is a fragile approach.