This tab only shows when SSL/TLS is enabled for your server, which in turn depends on the server Edition and registration key.
The certificate is used for secure-FTP connections and data transfers that use SSL/TLS. When a secure-FTP client connects an "SSL handshake" ensues. Its purpose is to establish the server’s identity, an encryption key for use during that session, and a specific cipher to encrypt the session data with. The SSL handshake works as follows: First, the client sends a list of ciphers it’s willing to support to the server. Next, the server chooses a cipher for use during the subsequent session and sends over its certificate together with a big random number. The certificate tells the client who the server is and it contains an encryption key, called the server’s "public key". The client also creates a large random number and encrypts this using the server’s public key from the certificate. Next the server decrypts the client’s message using its "private key" (that corresponds to the server’s public key). Both client and server now use the random values to create a unique "session key" for encryption of the subsequent session and from there on both sides use that key and the selected cipher to encrypt the rest of their session. That is the SSL handshake in a nutshell, somewhat simplified but it gets the idea across.
For secure Web servers a trusted third party, like Verisign that vouches for the server’s identity normally signs the server certificate. In the case of Serv-U’s certificate it is a "self signed" certificate, meaning it is signed by the server itself. This means it does not provide any guarantees for the server’s identity (since you can enter any values you like), but it does give the client a public key for encryption. Any time you make changes to the server’s certificate Serv-U automatically generates a new self-signed certificate with new, random, public and private keys for use by the server.
If you are going to use Serv-U for secure-FTP you must create your own server certificate. The server's private key needs to be a secret and the default key that gets installed is the same for every installation and thus no secret. To create your own certificate just enter your own certificate values and save them.
The following entries are part of the SSL certificate:
This should be set to the server’s IP name, or if no IP name is available the server’s IP address. The client normally checks if the certificate’s common name matches with the server’s IP name and will show a warning to the user if not.
Set this to the E-mail address you want FTP clients to see.
Set this to the name of your company or organization, like "Cat Soft, LLC" or "RhinoSoft.com".
Unit
This should be set to the organizational unit that owns the certificate, like "Software" or "IT".
Set this to the city or town where you are located.
Set this to the state or province where you are located.
This has to be the 2-letter abbreviation of the country where you are located (as defined in the ISO-3166 standard), like "US" for United States. Valid country codes are:
Afghanistan AF
Albania AL
Algeria DZ
American Samoa AS
Andorra AD
Angola AO
Anguilla AI
Antarctica AQ
Antigua and Barbuda AG
Argentina AR
Armenia AM
Aruba AW
Australia AU
Austria AT
Azerbaijan AZ
Bahamas BS
Bahrain BH
Bangladesh BD
Barbados BB
Belarus BY
Belgium BE
Belize BZ
Benin BJ
Bermuda BM
Bhutan BT
Bolivia BO
Bosnia and Herzegovina BA
Botswana BW
Bouvet Island BV
Brazil BR
British Indian Ocean Territory IO
Brunei Darussalam BN
Bulgaria BG
Burkina Faso BF
Burundi BI
Cambodia KH
Cameroon CM
Canada CA
Cape Verde CV
Cayman Islands KY
Central African Republic CF
Chad TD
Chile CL
China CN
Christmas Island CX
Cocos (Keeling) Islands CC
Colombia CO
Comoros KM
Congo CG
Congo, The Democratic Republic Of The CD
Cook Islands CK
Costa Rica CR
Côte D'ivoire CI
Croatia HR
Cuba CU
Cyprus CY
Czech Republic CZ
Denmark DK
Djibouti DJ
Dominica DM
Dominican Republic DO
East Timor TP
Ecuador EC
Egypt EG
El Salvador SV
Equatorial Guinea GQ
Eritrea ER
Estonia EE
Ethiopia ET
Falkland Islands (Malvinas) FK
Faroe Islands FO
Fiji FJ
Finland FI
France FR
French Guiana GF
French Polynesia PF
French Southern Territories TF
Gabon GA
Gambia GM
Georgia GE
Germany DE
Ghana GH
Gibraltar GI
Greece GR
Greenland GL
Grenada GD
Guadeloupe GP
Guam GU
Guatemala GT
Guinea GN
Guinea-Bissau GW
Guyana GY
Haiti HT
Heard Island and Mcdonald Islands HM
Holy See (Vatican City State) VA
Honduras HN
Hong Kong HK
Hungary HU
Iceland IS
India IN
Indonesia ID
Iran, Islamic Republic Of IR
Iraq IQ
Ireland IE
Israel IL
Italy IT
Jamaica JM
Japan JP
Jordan JO
Kazakstan KZ
Kenya KE
Kiribati KI
Korea, Democratic People's Republic Of KP
Korea, Republic Of KR
Kuwait KW
Kyrgyzstan KG
Lao People's Democratic Republic LA
Latvia LV
Lebanon LB
Lesotho LS
Liberia LR
Libyan Arab Jamahiriya LY
Liechtenstein LI
Lithuania LT
Luxembourg LU
Macau MO
Macedonia, The Former Yugoslav Republic Of MK
Madagascar MG
Malawi MW
Malaysia MY
Maldives MV
Mali ML
Malta MT
Marshall Islands MH
Martinique MQ
Mauritania MR
Mauritius MU
Mayotte YT
Mexico MX
Micronesia, Federated States Of FM
Moldova, Republic Of MD
Monaco MC
Mongolia MN
Montserrat MS
Morocco MA
Mozambique MZ
Myanmar MM
Namibia NA
Nauru NR
Nepal NP
Netherlands NL
Netherlands Antilles AN
New Caledonia NC
New Zealand NZ
Nicaragua NI
Niger NE
Nigeria NG
Niue NU
Norfolk Island NF
Northern Mariana Islands MP
Norway NO
Oman OM
Pakistan PK
Palau PW
Palestinian Territory, occupied PS
Panama PA
Papua New Guinea PG
Paraguay PY
Peru PE
Philippines PH
Pitcairn PN
Poland PL
Portugal PT
Puerto Rico PR
Qatar QA
Réunion RE
Romania RO
Russian Federation RU
Rwanda RW
Saint Helena SH
Saint Kitts and Nevis KN
Saint Lucia LC
Saint Pierre and Miquelon PM
Saint Vincent and The Grenadines VC
Samoa WS
San Marino SM
Sao Tome And Principe ST
Saudi Arabia SA
Senegal SN
Seychelles SC
Sierra Leone SL
Singapore SG
Slovakia SK
Slovenia SI
Solomon Islands SB
Somalia SO
South Africa ZA
South Georgia and The South Sandwich Islands GS
Spain ES
Sri Lanka LK
Sudan SD
Suriname SR
Svalbard and Jan Mayen SJ
Swaziland SZ
Sweden SE
Switzerland CH
Syrian Arab Republic SY
Taiwan, Province Of China TW
Tajikistan TJ
Tanzania, United Republic Of TZ
Thailand TH
Togo TG
Tokelau TK
Tonga TO
Trinidad and Tobago TT
Tunisia TN
Turkey TR
Turkmenistan TM
Turks and Caicos Islands TC
Tuvalu TV
Uganda UG
Ukraine UA
United Arab Emirates AE
United Kingdom GB
United States US
United States, minor outlying islands UM
Uruguay UY
Uzbekistan UZ
Vanuatu VU
Vatican City State, see Holy See
Venezuela VE
Viet Nam VN
Virgin Islands, British VG
Virgin Islands, U.S. VI
Wallis and Futuna WF
Western Sahara EH
Yemen YE
Yugoslavia YU
Zaire, see Congo, The Democratic Republic Of The
Zambia ZM
Zimbabwe ZW