invalid SSL_version specified at /usr/share/perl5/IO/Socket/SSL.pm line 332

There is a bug report on Debian's bug tracker website: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=679911

It also states a workaround:

specify -o tls=no as an option on the command line.

Thanks @Manolo Díaz on debian.org.

Actually, just take the default (remove the second parameter). See https://metacpan.org/pod/IO::Socket::SSL (search for SSL_version). The default is SSLv23:!SSLv3:!SSLv2.

I modified line 1906 in v1.56 to read

#        if (! IO::Socket::SSL->start_SSL($SERVER, SSL_version => 'SSLv3 TLSv1')) {
    if (! IO::Socket::SSL->start_SSL($SERVER)) {

(just commenting out the original line)

Easier workaround is:

Replace:

m{^(!?)(?:(SSL(?:v2|v3|v23|v2/3))|(TLSv1[12]?))$}i

With:

m{^(!?)(?:(SSL(?:v2|v3|v23|v2/3))|(TLSv1[12]?))}i