> For the complete documentation index, see [llms.txt](https://docs.h4rithd.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.h4rithd.com/tcp.md).

# TCP

- [FTP | 21](https://docs.h4rithd.com/tcp/21-ftp.md): Penetration Testing on FTP
- [SSH | 22](https://docs.h4rithd.com/tcp/22-ssh.md)
- [SMTP | 25, 587](https://docs.h4rithd.com/tcp/25-smtp.md): Port 25 is the standard SMTP port for server-to-server email relay but is often blocked due to spam abuse; port 587 is the recommended default for secure email submission, while port 465 is a legacy.
- [DNS | 53](https://docs.h4rithd.com/tcp/53-dns.md)
- [Finger | 79](https://docs.h4rithd.com/tcp/79-finger.md)
- [POP3 & IMAP | 110, 143, 993](https://docs.h4rithd.com/tcp/110-pop3.md)
- [RPC & NFS | 111, 2049](https://docs.h4rithd.com/tcp/2049-nfs.md): NFS  allows systems to access and share files over a network as if they were local. RPC enables programs to execute functions on remote systems, supporting services like NFS through netw communication
- [LDAP | 389, 636](https://docs.h4rithd.com/tcp/389-ldap.md): LDAP typically uses port 389 for unencrypted communication and port 636 for encrypted connections (LDAPS). While 389 is the default for unencrypted LDAP, 636 is the standard for LDAP over SSL/TLS.
- [HTTPS | 443](https://docs.h4rithd.com/tcp/443-https.md)
- [SMB | 445, 139](https://docs.h4rithd.com/tcp/smb-or-445-139.md): Modern SMB (like SMBv2/v3) typically uses only TCP 445, while older versions (SMBv1) may use 139 and NetBIOS-related ports.
- [Squid Proxy | 3128](https://docs.h4rithd.com/tcp/3128-squid-proxy.md)
- [Subversion | 3690](https://docs.h4rithd.com/tcp/3690-subversion.md): Subversion (svn server)
- [Redis | 6379](https://docs.h4rithd.com/tcp/redis-or-6379.md)
- [Elasticsearch | 9200](https://docs.h4rithd.com/tcp/9200-elasticsearch.md)
- [Memcached | 11211](https://docs.h4rithd.com/tcp/11211-memcached.md)
- [Gluster | 24007, 49152](https://docs.h4rithd.com/tcp/24007-and-49152-gluster.md)