TLS - 500 - SSL negotiation failed

Hello,

we have a connection problem after switching from SSL to TLS: 

VCENTER 5.1.0

VMware-vSphere-Perl-SDK-6.0.0-2503617.x86_64

SDK-API for PErl to restrict connection to TLS only, we after added the line "<sslVersion>tlsv1</sslVersion>" to the section <vpxd> in the config-file vpxd.cfg.

Unfortunately we get an error now and cannot connect anymore.

Server version unavailable at 'https://<MyIpAddr>:443/sdk/vimService.wsdl' at ...../VMware/VICommon.pm line 728.

I figured out this error:

":1: parser error : Start tag expected, '<' not found

500 - SSL negotiation failed"

Any ideas?

Many thanks in advance!

Juergen