buildfarm server suddenly not talking to old SSL stacks?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-www(at)lists(dot)postgresql(dot)org
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>
Subject: buildfarm server suddenly not talking to old SSL stacks?
Date: 2018-07-17 03:31:54
Message-ID: 28090.1531798314@sss.pgh.pa.us
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My buildfarm animals dromedary and prairiedog have been failing since
around 9AM EDT on Sunday. The buildfarm script output isn't very
detailed:

getting branches of interest (https://buildfarm.postgresql.org/branches_of_inte\
rest.txt) at ./run_branches.pl line 129.

but trying it manually yields

$ curl https://buildfarm.postgresql.org/branches_of_interest.txt
curl: (35) error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version

The same thing works fine on newer machines though, as does fetching with
http: instead of https:. Have we done something recently to create an
incompatibility with old SSL stacks?

regards, tom lane

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