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Protocol details, Table 149, Option definitions

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Overview of Web features Web Configuration Table 149 Option definitions Option Denied Request Headers and Denied Response Headers Definition Specifies a variety of headers to be denied. For example, the Accept-Ranges response means that the server is offering to send data in several parts to the clients. By default, the appliance blocks the Accept-Ranges response header because the server is advertising that it can send data to the clients in several parts. The appliance cannot scan partial files properly, so the appliance removes this header to maintain good security. Add VIA headers to Specifies headers, which are intended to: • Track messages forwards. • Avoid request loops. • Identify the protocol capabilities of all senders along the request/response chain. The Via general-header field is used by gateways and proxies to indicate the intermediate protocols and recipients between the client and the server on requests, and between the original server and the client on responses. Protocol details Table 150 Option definitions Option Display NTLM failure messages Definition Some clients and servers use the Microsoft Windows NT LAN Manager (NTLM) authentication protocol for the secure transmission of credentials, including passwords. Sometimes, the NTLM authentication process fails. For example, if a client using a web browser configured to operate in proxy mode tries to connect via the appliance to a server that requires NTLM authentication, the authentication fails. Forward non-compliant POST requests A POST request is a request made by an HTTP client to send data to a server. A non-compliant POST request occurs when the client (web browser) appends non-compliant characters, such as line breaks, to the POST request. Such malformed requests might be part of an attack on a web server. Default value is Off. Maximum requests per persistent connection Downgrade to HTTP v1.0 TRACE and OPTIONS requests Specifies the maximum number of requests that can be made through the same connection before the appliance drops the connection. Default value is 256. Some clients and servers support HTTP version 1.0 only. The appliance supports HTTP version 1.1 protocol. To communicate with older clients and servers, the appliance can be configured to use HTTP version 1.0 when dealing with HTTP requests or redirections. See the HTTP RFC (2616) for more information. Advanced settings Changing these settings can affect scanning performance. If you are not sure about the impact of making any changes, ask your network expert. Server for internal information pages Authentication types not requiring persistence If several appliances are in use, specifies which appliance to use for authentication. This field is normally blank, and therefore this appliance is used. These settings are required for NTLM. These settings are not required for Kerberos. 168 McAfee Email and Web Security Appliances 5.6.0 Product Guide

Section	Page
Contents	3
Preface	7
About this guide	7
Audience	7
Conventions	7
Finding product documentation	8
Contact information	8
Optional components and related products	8
Working with your McAfee Email and Web Security Appliances	9
The interface	10
Common tasks within the interface	12
Enabling each feature	12
Making changes to the appliance's configuration	12
Using lists	13
Making and viewing lists	13
Adding information to a list	13
Removing single items from a list	13
Removing many items from a list	13
Changing information in a list	14
Viewing information in a long list	14
Ordering information in a list	14
Ordering information alphabetically in a list	15
Importing and exporting information	15
Importing prepared information	15
Exporting prepared information	15
Ports used by Email and Web Security Appliances	16
Resources	17
Overview of Dashboard features	21
Dashboard	21
Edit Preferences	25
Graphs Edit Preferences	27
Overview of Reports features	29
Types of reports	29
Scheduled Reports	30
Email Reports overview	33
Interactive Reporting — Total view	37
Interactive Reporting — Time view	38
Interactive Reporting — Itemized view	38
Interactive Reporting — Detail view	39
Selection — Favorites	40
Selection — Filter	40
Web Reports overview	43
Interactive Reporting — Total view	46
Interactive Reporting — Time view	47
Interactive Reporting — Itemized view	47
Interactive Reporting — Detail view	48
Selection — Favorites	49
Selection — Filter	49
System Reports	52
Interactive Reporting — Detail view	54
Selection — Favorites	54
Selection — Filter	55
Overview of Email features	59
Life of an email message	59
Message Search	62
Email Overview	70
Email Configuration	71
Protocol Configuration	72
Connection Settings (SMTP)	72
Basic SMTP settings	72
Message rate warning thresholds	73
Timeouts	73
Protocol Settings (SMTP)	74
Data command options	75
Denial of service protection	75
Message processing	76
Transparency options (router and bridge mode only)	78
Address parsing options	79
Address Masquerading (SMTP)	79
Sender address masquerading	80
Recipient address aliasing	81
Transport Layer Security (SMTP)	81
TLS Connections	82
Certificate management	82
TLS options (advanced)	84
Connection and Protocol Settings (POP3)	84
Basic POP3 settings	85
Timeouts	85
POP3 protocol settings	86
Receiving Email	86
Permit and Deny Lists	86
Anti-Relay Settings	89
Recipient Authentication	93
Bounce Address Tag Validation	96
Sending Email	97
Email Policies	101
Introduction to policies	101
SMTP policies	102
POP3 policies	102
Email Scanning Policies menu	103
Settings for scanning viruses and similar threats	104
Anti-virus features	105
What is a potentially unwanted program (PUP)?	106
Types of anti-virus scanning	106
Customized anti-virus settings	107
Detection of new and unknown viruses	107
Special actions against packers and PUPs	108
Problems with alerts for mass mailers	108
McAfee Global Threat Intelligence	109
About Protocol Presets	109
Email Scanning Policies	109
Scanning Policies - Add Policy...	114
Anti-Virus Settings — Basic options	116
Anti-Virus Settings — McAfee Anti-Spyware	117
Anti-Virus Settings — Packers	117
Anti-Virus Settings — Custom Malware Options	118
Anti-Spam Settings — Basic Options	119
Anti-Spam Settings — Advanced Options	120
Anti-Spam Settings — Blacklists and Whitelists	120
Anti-Spam Settings — Rules	121
Anti-Phish Settings	121
Sender Authentication Settings — Message reputation	123
Sender Authentication Settings — RBL Configuration	123
Sender Authentication Settings — SPF, Sender ID and DKIM	124
Sender Authentication Settings — Cumulative Score and Other Options	125
File Filtering Settings	125
About file filtering	126
Data Loss Prevention Settings	127
Mail Size Filtering Settings — Message Size	129
Mail Size Filtering Settings — Attachment Size	129
Mail Size Filtering Settings — Attachment Count	130
Compliance Settings	130
Rule Creation Wizard	133
Rule Creation Wizard	134
Scanner Limits	135
Content Handling Settings — Email Options — Basic Options	136
Content Handling Settings — Email Options — Advanced Options	137
Content Handling Settings — Email Options — Missing/Empty Headers	137
Content Handling Settings — Email Options — Text and binary MIME types	138
About MIME formats	138
Content Handling Settings — Email Options — Character sets	139
Content Handling Settings — HTML Options	139
Content Handling Settings — Corrupt or Unreadable Content — Corrupt content	140
Content Handling Settings — Corrupt or Unreadable Content — Encrypted content	140
Content Handling Settings — Corrupt or Unreadable Content — Protected files	141
Content Handling Settings — Corrupt or Unreadable Content — Partial/external messages	141
Content Handling Settings — Corrupt or Unreadable Content — Signed messages	142
Alert Settings	142
Notification and Routing Settings — Notification Emails	143
Notification and Routing Settings — Audit Copies	144
Notification and Routing Settings — Routing	144
Notification and Routing Settings — SMTP Relays	145
Notification and Routing Settings — Email Recipients	145
McAfee Global Threat Intelligence (GTI) Feedback Settings	145
Dictionaries	146
Add Dictionary Details	154
New Condition	154
Registered Documents	155
Quarantine Configuration	159
Quarantine Options	159
Quarantine Digest Options	160
Digest Message Content	161
Overview of Web features	163
Web Configuration	163
HTTP Connection Settings	163
HTTP Protocol Settings	165
ICAP Connection Settings	169
ICAP Authentication	171
ICAP Protocol Settings	172
FTP Connection Settings	174
FTP Protocol Settings	175
Web Policies	178
Introduction to policies	178
FTP policies	178
ICAP policies	178
HTTP policies	179
Web Scanning Policies	179
Scanning Policies - Add Policy...	183
Anti-Virus Settings — Basic options	184
Anti-Virus Settings — McAfee Anti-Spyware	185
Anti-Virus Settings — Packers	186
Anti-Virus Settings — Custom Malware Options	187
HTTPS Web Categorization Settings	187
HTTPS Web Categorization - McAfee GTI Web Categorization	188
URL Blacklisting and Whitelisting	188
SiteAdvisor Web Reputation	189
Web Categorization	190
User Categorized URLs	190
Alerts and Settings	191
Compliance Settings	191
Streaming Media	194
Instant Messaging	194
Scanner Limits	194
Content Handling Settings — HTML Options	195
Content Handling Settings — Corrupt or Unreadable Content — Corrupt content	196
Content Handling Settings — Corrupt or Unreadable Content — Protected files	196
HTTP Scanning	197
Dictionaries	197
Add Dictionary Details	205
New Condition	205
Overview of System features	207
Appliance Management	207
General	207
Network Interfaces Wizard	208
DNS and Routing	212
Time and Date	214
Appliance Management — Remote Access	215
UPS Settings	219
Add UPS Device	221
Database Maintenance	222
Retention Limits	222
Event Options	223
External Access	224
Maintenance	225
Appliance Management — System Administration	225
System Commands	226
Manage Internal Rescue Image	227
Benefits of using the internal rescue image	231
Manage Internal Rescue Image option definitions	231
Default Server Settings	232
Cluster Management	233
Backup and Restore Configuration	233
Configuration Push	235
Load Balancing	236
Network Interfaces Wizard — Cluster Management	238
Resilient Mode	239
Users, Groups and Services	240
Directory Services	240
Web User Authentication	240
Policy Groups	241
Role-Based User Accounts	241
Add Login Service	243
Configuring Kerberos authentication using Active Directory 2003	246
Virtual Hosting	250
Virtual Hosts	250
Add Virtual Host	253
Virtual Networks	255
Edit Virtual Network	255
Certificate Management	256
Certificates	256
CA certificates	256
TLS certificates and keys	257
Appliance HTTPS certificate	259
Certificate Revocation lists (CRLs)	259
Installed CRLs	260
CRL updates	260
Logging, Alerting and SNMP	261
Email Alerting	261
Alert tokens for Email alert messages	262
SNMP Alert Settings	268
SNMP Monitor Settings	268
System Log Settings	269
Extended Syslog attributes for ArcSight	270
Extended Syslog attributes for Splunk	272
WebReporter	275
Logging Configuration	275
Component Management	276
Update Status	276
Specify the server settings for downloading the update via HTTP	279
Specify the server settings for downloading the update via FTP	280
Time to schedule update for	280
Specify the server settings for downloading spam updates	281
Configure Web Categorization Updates	281
Configure Automatic Package Updates	282
Package Installer	282
ePO	283
Setup Wizard	284
Welcome	285
Transparent Bridge Mode	285
Transparent Router mode	286
Explicit Proxy mode	287
Standard Setup	287
Traffic — Standard setup	288
Basic Settings - Standard setup	288
Summary — Standard setup	290
Custom Setup	290
Traffic — Custom setup	291
Basic Settings - Custom setup	292
Network Settings	292
Cluster Management	293
DNS and Routing	294
Time Settings	295
Password	296
Summary — Custom setup	296
Restore from a file Setup	297
Import Configuration	297
Values to Restore	298
Traffic — Custom setup	298
Basic Settings - Custom setup	299
Cluster Management	299
DNS and Routing	301
Time Settings	302
Password	302
Summary — Custom setup	303
ePO Managed Setup	303
Settings for ePO Management	304
Basic Settings -- ePO Managed Setup	305
Network Settings	305
Cluster Management	306
DNS and Routing	307
Time Settings	307
Password	308
Summary — ePO Managed Setup	308
Overview of Troubleshoot features	311
Troubleshooting Tools	311
Ping and Trace Route	312
System Load	312
Route Information	313
Disk Space	314
Troubleshooting Reports	314
Minimum Escalation Report	314
Capture Network Traffic	315
Save Quarantine	316
Log Files	316
Error Reporting Tool	318
Tests	318
System Tests	318
How appliances work with ePolicy Orchestrator	321
Configuring your appliance for ePolicy Orchestrator management	323
Managing your appliances from within ePolicy Orchestrator	325
Index	327
A	327
B	327
C	327
D	328
E	328
F	328
G	329
H	329
I	329
K	329
L	329
M	329
N	330
O	330
P	330
Q	330
R	330
S	331
T	331
U	332
V	332

Match case Limit results 1 per page

Table 149

Option definitions

Option

Definition

Denied Request

Headers

and

Denied Response

Headers

Specifies a variety of headers to be denied.

For example, the

Accept-Ranges

response means that the server is offering to send

data in several parts to the clients.

By default, the appliance blocks the

Accept-Ranges

response header because the

server is advertising that it can send data to the clients

in several parts

. The

appliance cannot scan partial files properly, so the appliance removes this header to

maintain good security.

Add VIA headers to

Specifies headers, which are intended to:

•

Track messages forwards.

•

Avoid request loops.

•

Identify the protocol capabilities of all senders along the request/response chain.

The Via general-header field is used by gateways and proxies to indicate the

intermediate protocols and recipients between the client and the server on

requests, and between the original server and the client on responses.

Protocol details

Table 150

Option definitions

Option

Definition

Display NTLM failure

messages

Some clients and servers use the Microsoft Windows NT LAN Manager (NTLM)

authentication protocol for the secure transmission of credentials, including

passwords.

Sometimes, the NTLM authentication process fails. For example, if a client

using a web browser configured to operate in proxy mode tries to connect via

the appliance to a server that requires NTLM authentication, the authentication

fails.

Forward non-compliant

POST requests

A POST request is a request made by an HTTP client to send data to a server.

A non-compliant POST request occurs when the client (web browser) appends

non-compliant characters, such as line breaks, to the POST request. Such

malformed requests might be part of an attack on a web server. Default value

is Off.

Maximum requests per

persistent connection

Specifies the maximum number of requests that can be made through the

same connection before the appliance drops the connection. Default value is 256.

Downgrade to HTTP v1.0

Some clients and servers support HTTP version 1.0 only. The appliance

supports HTTP version 1.1 protocol. To communicate with older clients and

servers, the appliance can be configured to use HTTP version 1.0 when dealing

with HTTP requests or redirections.

TRACE and OPTIONS

requests

See the HTTP RFC (2616) for more information.

Advanced settings

Changing these settings can affect scanning performance. If you are not sure

about the impact of making any changes, ask your network expert.

Server for internal

information pages

If several appliances are in use, specifies which appliance to use for

authentication. This field is normally blank, and therefore this appliance is used.

Authentication types not

requiring persistence

These settings are required for NTLM.

These settings are not required for Kerberos.

Overview of Web features

Web Configuration

168

McAfee Email and Web Security Appliances 5.6.0 Product Guide