HTTP Error 401 for Ticker upgrades_downgrades, info, etc

[shamikganguly]

Describe bug

I am using yfinance.Ticker class to fetch upgrades_downgrades for a stock. Getting "HTTP error 401" for this. This worked fine yesterday. Seems to be something from last evening. I don't access this very frequently, maybe once or twice a day, so does not appear to be rate based blocking etc. I have able to see the data at Yahoo Finance website as well.

Simple code that reproduces your problem

import yfinance as yf

    print(yf.__version__)
    yf.enable_debug_mode()
    df = yf.Ticker(symbol).upgrades_downgrades.reset_index()

Debug log from yf.enable_debug_mode()

0.2.63
DEBUG get_raw_json(): https://query2.finance.yahoo.com/v10/finance/quoteSummary/AMZN
DEBUG Entering get()
DEBUG Entering _make_request()
DEBUG url=https://query2.finance.yahoo.com/v10/finance/quoteSummary/AMZN
DEBUG params={'modules': 'upgradeDowngradeHistory', 'corsDomain': 'finance.yahoo.com', 'formatted': 'false', 'symbol': 'AMZN'}
DEBUG Entering _get_cookie_and_crumb()
DEBUG cookie_mode = 'basic'
DEBUG Entering _get_cookie_and_crumb_basic()
DEBUG Entering _get_cookie_basic()
DEBUG Entering _load_cookie_curlCffi()
DEBUG Exiting _load_cookie_curlCffi()
DEBUG reusing persistent cookie
DEBUG Exiting _get_cookie_basic()
DEBUG Entering _get_crumb_basic()
DEBUG Entering _get_cookie_basic()
DEBUG reusing cookie
DEBUG Exiting _get_cookie_basic()
DEBUG crumb = '75nzMgqhILN'
DEBUG Exiting _get_crumb_basic()
DEBUG Exiting _get_cookie_and_crumb_basic()
DEBUG Exiting _get_cookie_and_crumb()
DEBUG response code=401
DEBUG toggling cookie strategy basic -> csrf
DEBUG Entering _get_cookie_and_crumb()
DEBUG cookie_mode = 'csrf'
DEBUG Entering _get_crumb_csrf()
DEBUG Entering _get_cookie_csrf()
DEBUG Entering _load_cookie_curlCffi()
DEBUG Exiting _load_cookie_curlCffi()
DEBUG reusing persistent cookie
DEBUG Exiting _get_cookie_csrf()
DEBUG crumb = '75nzMgqhILN'
DEBUG Exiting _get_crumb_csrf()
DEBUG Exiting _get_cookie_and_crumb()
DEBUG response code=401
DEBUG Exiting _make_request()
DEBUG Exiting get()
ERROR HTTP Error 401:

Bad data proof

No response

yfinance version

0.2.63

Python version

3.13.4

Operating system

ProductName:macOS ProductVersion:15.4.1 BuildVersion:24E263

[weirdapps]

I can confirm the same issue

[ShortFinder]

I can confirm same.

[shah314]

Same here. Retrieving industry has the same issue.

[Thenolypus]

I had the same error at first, then i updated my yfinance with the latest release that was uploaded today pip install yfinance --upgrade and now it works again. Maybe you could try to reinstall yfinance?

[wallylee99]

Same 401 error here, and looking at the latest version change log, it's about fixing download(ISIN), wonder if that's related, but thanks Thenolypus.

[shamikganguly]

I had the same error at first, then i updated my yfinance with the latest release that was uploaded today pip install yfinance --upgrade and now it works again. Maybe you could try to reinstall yfinance?

Have already done this. Latest version is 0.2.63. Still same issue

[glstein78]

Agreed, I have the latest as well and all fundamental data also fails:

"marketCap", "forwardPE", "dividendYield", "beta", "trailingPE", "epsTrailingTwelveMonths", "epsForward", "priceToBook", "debtToEquity", "recommendationMean",

All of that gets a 401 as well.

[venil7]

i get the same issue

[lhjnilsson]

The call depends on quoteHistory api endpoint of yahoo, seems like their own webpage is having issues reaching - with 401 error.
Probably something happening out of this libraries control

[ValueRaider]

My contribution: I confirmed error when bug report first posted, later worked once, then back to failing now.

[ValueRaider]

Just seen reports of many internet services having problems, might not be Yahoo this time. https://downdetector.com/