[squid-users] TCP_MISS/503

[Amos Jeffries]

On 25/06/2015 4:48 p.m., Hector Chan wrote:
> Not sure if this will help you, but I saw 503s on my squid when the origin
> server has an invalid SSL certificate -- expired cert, self-signed cert,
> etc.
> 

Nod. They show up whenever Squid cannot successfully connect to the
server. Thats what "503 Service Unavailable" means - unable to connect
to server. And there are a huge amount of reasons that may happen.
Anything that breaks the server connection encryption during SSL-bump
would do it.

Amos