Why fail to open secure connection to the client incidentally, and what's the proper cleaning strategy for the generated certificates?

I'm using privoxy v3.0.32 on macosx v10.15.6 catalina. With https
inspection on.

With those debug options set:

> debug  1024 # Log the destination for requests Privoxy didn't let through, and the reason why.
> debug  8192 # Non-fatal errors
>
>
I incidentally get some error logs like this:

> 2021-03-15 10:07:44.978 7f863fa1f700 Error: The TLS/SSL handshake with the
> client failed: error:1408F09C:SSL routines:ssl3_get_record:http request
> 2021-03-15 10:07:44.978 7f863fa1f700 Error: Failed to open a secure
> connection with the client
>

Anybody have ideas about this error msg?

As long as I'm using https inspection, I wrote a program to delete the
generated certificate files older than 11 hours. But I don't know if this
is the best cleaning strategy.
I also get some errors like this:

> 2021-03-15 10:10:07.260 7f86209e1700 Error: X509 subject name (code: CN,
> val:
> only-d-pmjr9f4mclevwwl2mwckreicm8k1afzk-1615774207025.nstool.netease.com)
> error: error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too
> long
> 2021-03-15 10:10:07.260 7f86209e1700 Error: generate_host_certificate
> failed: -1
> 2021-03-15 10:10:07.260 7f86209e1700 Error: Failed to open a secure
> connection with the client
> 2021-03-15 10:10:07.268 7f86209e1700 Error: A website key already exists
> but there's no matching certificate. Removing
> /tmp/privoxyTmp/certGen/6e8849e15804dbafb007349e8271b483.pem before
> creating a new key and certificate.
> 2021-03-15 10:10:07.653 7f86209e1700 Error: X509 subject name (code: CN,
> val:
> only-d-pmjr9f4mclevwwl2mwckreicm8k1afzk-1615774207025.nstool.netease.com)
> error: error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too
> long
> 2021-03-15 10:10:07.654 7f86209e1700 Error: generate_host_certificate
> failed: -1
> 2021-03-15 10:10:07.654 7f86209e1700 Error: Failed to open a secure
> connection with the client
>

Are these errors related to my certificates cleaning? What's next I can do
to try to fix it?

thanks.

-- 
Regards.
Wen Yue