curl-w32/docs/cmdline-opts/socks5-gssapi-nec.md

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Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl socks5-gssapi-nec Compatibility with NEC SOCKS5 server 7.19.4 proxy auth boolean
socks5
--socks5-gssapi-nec --socks5 hostname:4096 $URL

--socks5-gssapi-nec

As part of the GSS-API negotiation a protection mode is negotiated. RFC 1961 says in section 4.3/4.4 it should be protected, but the NEC reference implementation does not. The option --socks5-gssapi-nec allows the unprotected exchange of the protection mode negotiation.