Vote for SecureSOCKS5
SecureSOCKS5 is an extension for Microsoft ISA Server that enables SOCKS5 support. SOCKS5 clients are subject to ISA policy rules so their access is managed in the same way as for Firewall clients and SecureNAT clients. SecureSOCKS5 implementation is based on RFC 1928 (SOCKS Protocol Version 5) and RFC 1929 (Username/Password Authentication for SOCKS V5). Both ISA Server 2000 and ISA Server 2004 are supported.