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在PHP中開發時，我使用了具有嵌入式FTP客戶端的PHPStorm IDE。每當我上傳一個文件到FTP服務器，我會得到2-5秒的延遲，這導致文件上傳花費大約10-15秒。它必須與SSL相關，或者由FTP客戶端進行網絡協商或驗證服務器證書。每當我切換到FTP時，上傳都很快。我還應該補充說，當我連接一個不同的客戶端（FileZilla）時，上傳和下載工作非常好。我排除了UseIPv6和IdentLookups選項，將它們關閉不起作用。我以無源模式連接，所以也不會引起任何問題。FTPS 2-5秒延遲
我出來的想法，真的可以使用一些幫助！謝謝。
在Debian Wheezy機器上，FTP服務器是proftpd 1.3.4a。
proftpd.conf中：
Include /etc/proftpd/modules.conf
UseIPv6 on
IdentLookups on
ServerName "domain.tld"
ServerType standalone
DeferWelcome on
MultilineRFC2228 on
DefaultServer on
ShowSymlinks on
TimeoutNoTransfer 600
TimeoutStalled 600
TimeoutIdle 1200
DisplayLogin welcome.msg
DisplayChdir .message true
ListOptions "-l"
DenyFilter \*.*/
DefaultRoot ~
RequireValidShell on
Port 21
PassivePorts 49152 65534
MaxInstances 30
Umask 027 027
AllowOverwrite on
AuthOrder mod_sql.c
# UseSendFile off
<IfModule mod_quotatab.c>
QuotaEngine off
</IfModule>
<IfModule mod_ratio.c>
Ratios off
</IfModule>
<IfModule mod_delay.c>
DelayEngine off
</IfModule>
#
# Alternative authentication frameworks
#
#Include /etc/proftpd/ldap.conf
Include /etc/proftpd/sql.conf
#
# This is used for FTPS connections
#
Include /etc/proftpd/tls.conf
tls.conf：
<IfModule mod_tls.c>
TLSEngine on
TLSLog /var/log/proftpd/tls.log
TLSProtocol SSLv3 TLSv1
TLSRSACertificateFile /etc/ssl/localcerts/domain_tld.crt
TLSRSACertificateKeyFile /etc/ssl/localcerts/domain_tld.key
TLSCACertificatePath /etc/ssl/certs/
TLSOptions NoCertRequest EnableDiags NoSessionReuseRequired
#TLSVerifyClient on
TLSRequired auth
#TLSRenegotiate required off
</IfModule>
最後，從通過PHPStorm IDE上傳文件tls.log：
Aug 30 08:56:46 mod_tls/2.4.3[8365]: TLSOption EnableDiags enabled, setting diagnostics callback
Aug 30 08:56:46 mod_tls/2.4.3[8365]: TLS/TLS-C requested, starting TLS handshake
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: before/accept initialization
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: unknown state
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientHello' Handshake message (149 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client hello A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHello' Handshake message (81 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server hello A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Certificate' Handshake message (1299 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write certificate A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHelloDone' Handshake message (4 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server done A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientKeyExchange' Handshake message (262 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client key exchange A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] received TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] received TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read finished A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] sent TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write change cipher spec A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write finished A
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] ok: SSL negotiation finished successfully
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: SSL negotiation finished successfully
Aug 30 08:56:46 mod_tls/2.4.3[8365]: client supports secure renegotiations
Aug 30 08:56:46 mod_tls/2.4.3[8365]: TLSv1/SSLv3 connection accepted, using cipher AES128-SHA (128 bits)
Aug 30 08:56:46 mod_tls/2.4.3[8365]: Protection set to Private
Aug 30 08:56:46 mod_tls/2.4.3[8365]: starting TLS negotiation on data connection
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: before/accept initialization
Aug 30 08:56:46 mod_tls/2.4.3[8365]: [info] accepting: unknown state
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientHello' Handshake message (149 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client hello A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHello' Handshake message (81 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server hello A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Certificate' Handshake message (1299 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write certificate A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHelloDone' Handshake message (4 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server done A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientKeyExchange' Handshake message (262 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client key exchange A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read certificate verify A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] received TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] received TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read finished A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write change cipher spec A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write finished A
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:50 mod_tls/2.4.3[8365]: TLSv1/SSLv3 renegotiation accepted, using cipher AES128-SHA (128 bits)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] ok: SSL negotiation finished successfully
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: SSL negotiation finished successfully
Aug 30 08:56:50 mod_tls/2.4.3[8365]: TLSv1/SSLv3 data connection accepted, using cipher AES128-SHA (128 bits)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [msg] sent TLSv1 warning 'close_notify' Alert message (2 bytes)
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] writing: SSL/TLS alert warning: close notify
Aug 30 08:56:50 mod_tls/2.4.3[8365]: starting TLS negotiation on data connection
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: before/accept initialization
Aug 30 08:56:50 mod_tls/2.4.3[8365]: [info] accepting: unknown state
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientHello' Handshake message (149 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client hello A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHello' Handshake message (81 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server hello A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Certificate' Handshake message (1299 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write certificate A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHelloDone' Handshake message (4 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server done A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientKeyExchange' Handshake message (262 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client key exchange A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read certificate verify A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] received TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] received TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read finished A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write change cipher spec A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write finished A
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:52 mod_tls/2.4.3[8365]: TLSv1/SSLv3 renegotiation accepted, using cipher AES128-SHA (128 bits)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] ok: SSL negotiation finished successfully
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: SSL negotiation finished successfully
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] received TLSv1 warning 'close_notify' Alert message (2 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] reading: SSL/TLS alert warning: close notify
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [msg] sent TLSv1 warning 'close_notify' Alert message (2 bytes)
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] writing: SSL/TLS alert warning: close notify
Aug 30 08:56:52 mod_tls/2.4.3[8365]: starting TLS negotiation on data connection
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: before/accept initialization
Aug 30 08:56:52 mod_tls/2.4.3[8365]: [info] accepting: unknown state
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientHello' Handshake message (149 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client hello A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHello' Handshake message (81 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server hello A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Certificate' Handshake message (1299 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write certificate A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'ServerHelloDone' Handshake message (4 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write server done A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client certificate A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] received TLSv1 'ClientKeyExchange' Handshake message (262 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read client key exchange A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read certificate verify A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] received TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] received TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 read finished A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 ChangeCipherSpec message (1 byte)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write change cipher spec A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 'Finished' Handshake message (16 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 write finished A
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSLv3 flush data
Aug 30 08:56:54 mod_tls/2.4.3[8365]: TLSv1/SSLv3 renegotiation accepted, using cipher AES128-SHA (128 bits)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] ok: SSL negotiation finished successfully
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] accepting: SSL negotiation finished successfully
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [msg] sent TLSv1 warning 'close_notify' Alert message (2 bytes)
Aug 30 08:56:54 mod_tls/2.4.3[8365]: [info] writing: SSL/TLS alert warning: close notify