Why don't proxies work in the program on a virtual machine?

Question

Python

They work on my machine, on a virtual machine I get errors:

'Cannot connect to proxy.', timeout('_ssl.c:1106: The handshake operation timed out')

The code I use is clear, the same:

# чек прокси
    def check_proxy(self, proxies, headers):
        global timeout
        proxies = dict(https=proxies)
        # url = 'https://api.ipify.org/'
        url = 'https://api.vk.com/method/search.getHints'
        params = dict(v=self.version)
        try:
            if headers != '':
                res = requests.get(url, params, proxies=proxies, timeout=timeout, headers=headers)
            else:
                res = requests.get(url, params, proxies=proxies, timeout=timeout)
        except Exception as e:
            if 'Max retries' not in str(e) or 'Cannot connect to proxy' in str(e):
                with open('error\ошибки с прокси.txt', mode='a', encoding='utf-8') as file:
                    file.write(str(datetime.today()) + '\n' + str(proxies) + '\n' + str(e) + '\n' + '\n')
                return False
        return True

Is this a virtual machine problem? If yes, how to decide?

Increasing the timeout does not help

I tried it in the browser - it connects to the proxy there normally
PS I know about global variables, I'll fix it