Error code: sec_error_bad_signature

I am getting error: sec_error_bad_signature randomly on any pages. Domain is

There are some more errors when using link checker:

  1. Error: SSLError: [Errno 1] _ssl.c:510: error:0407006A:rsa routines:RSA_padding_check_PKCS1_type_1:block type is not 01
  2. Error: SSLError: [Errno 1] _ssl.c:510: error:140773F2:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert unexpected message

This seems to indicate it might be related to broken AV software with MitM capabilities. It’s unlikely to be related to your certificate or server configuration.

I am not using any AV software.

Alas ISPs, and even nation states may try to conduct MitM attacks, with a variety of purposes. So this could still be the cause even if you’re not doing anything wrong.

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