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GnuTLS error -73: ASN1 parser: Error in TAG.
The site in question is ftp.pp.xw.gm.com. I can retrieve the certificate from the implicit site with openssl s_client, but don't know how to dump the certificate for explicit FTP sites easily. Perhaps one of the developers here could attempt an anonymous connection and dissect the certificate a bit more.
I'll also go ping the GnuTLS folks and see if I can figure out how to extract a copy of the certificate easily when AUTH TLS negotiation is performed.
(FWIW, Filezilla 3.3.0.1 tested with no firewalling in place)