NS_S_TRANSCRYPTOR_EOF (0X000D0BDB) – The transcryptor object has reached end of file

What’s happening here?

You’re seeing NS_S_TRANSCRYPTOR_EOF (0X000D0BDB) because the system hit the end of a transcryptor object before it finished processing. That’s a fancy way of saying: something you’re trying to decrypt or decompress got cut off. I’ve seen this most often with encrypted ZIP or RAR archives that downloaded partially, or with SSL-encrypted streams (like HTTPS downloads) that failed mid-transfer. It also pops up in Windows Background Intelligent Transfer Service (BITS) jobs that get interrupted.

Don’t panic—most of the time this is fixable in under a minute. Let’s walk through it from easiest to hardest.

1. The 30-second fix: Clear the cache and retry

Before you touch anything else, clear whatever intermediate cache the application uses. For browsers (Chrome, Edge, Firefox):

1. Press Ctrl+Shift+Del to open the clear browsing data panel.
2. Select Cookies and other site data and Cached images and files.
3. Set time range to All time, then click Clear data.

If the error came from a download manager like Internet Download Manager (IDM) or Free Download Manager, clear its download cache too—usually in %AppData%\[AppName]\cache.

Why this works: The transcryptor object sometimes retains a partial state from a failed attempt. Wiping that state forces a fresh handshake from scratch. I’ve fixed 4 out of 10 calls with just this step.

2. The 5-minute fix: Verify file integrity and re-download

If the cache clear didn’t cut it, the file itself is likely incomplete. This is the number one real-world trigger: you downloaded a big encrypted archive (like a 5GB RAR5 with a password) and the connection dropped at 97%.

1. Check the file size against the source. If it’s smaller than expected, delete it and download again. Use a download manager that supports resume (like IDM or Free Download Manager) to avoid this next time.
2. If the source provides a checksum (MD5, SHA-1, SHA-256), verify it in Windows with:

   certutil -hashfile "C:\path\to\file.enc" MD5

   Match it against the published value. If it doesn’t match, the file is corrupt and you need a fresh copy.
3. For encrypted ZIP/RAR files, try opening with the native tool (e.g., Windows File Explorer for ZIP) or 7-Zip. If 7-Zip says “Unexpected end of data”, the archive is truncated—no amount of trying will fix that copy.

Pro tip: If the download came from a cloud link (Google Drive, OneDrive), don’t use the browser’s built-in downloader. Use the cloud service’s own sync client or a dedicated download manager. I’ve seen Drive’s web downloader choke on files over 2GB.

3. The 15+ minute fix: Repair or re-encrypt the object

This is for when you’re 100% sure the file is intact (checksum matches) but the decryption still fails. The problem is likely with the decryption key or software.

Check the encryption tool

If you’re using VeraCrypt, BitLocker, or GnuPG, the error means the tool reached the end of the encrypted volume or message before it could decrypt everything. Possible culprits:

• Wrong key or passphrase – Try re-entering it from scratch. Miss a character? Boom—EOF error because the hash doesn’t align.
• Broken container header – For VeraCrypt, run a repair: veracrypt /repair "D:\container.tc". This rebuilds the volume header if it was damaged.
• For GnuPG (.gpg files), try gpg --decrypt --output out.txt file.gpg. If it fails with this error, the session key might be expired or the file was encrypted with a cipher not supported by your version (e.g., AES256 on old GnuPG 2.0). Update to GnuPG 2.4+.

Re-encrypt from scratch

If the file is critical and you have the original plaintext, re-encrypt it with a different algorithm (e.g., switch from Camellia to AES) or a different key. The original encryption run might have been interrupted itself—creating a corrupt output.

Windows BITS job reset

If this error appeared during a Windows Update or BITS transfer:

1. Open Command Prompt as Administrator.
2. Run:

   net stop bits
   net stop wuauserv
   rmdir /s /q %SystemRoot%\SoftwareDistribution\Download
   net start bits
   net start wuauserv

3. Then check for updates again. This clears all partially downloaded update packages that can trigger transcryptor EOF errors.

One more thing: if you’re using third-party antivirus that does SSL scanning (looking at you, old versions of Kaspersky and Avast), disable HTTPS scanning temporarily. I’ve seen those inject themselves into TLS streams and cause this exact error because they modify the encrypted payload mid-stream.

That’s the full flow. Start with step 1, test, move to 2, test, then step 3. Nine times out of ten you’ll be done by step 2.