Cisco Cisco Web Security Appliance S670 User Guide
5-5
Cisco IronPort AsyncOS 7.7 for Web User Guide
Chapter 5 Web Proxy Services
Configuring the Web Proxy
Persistent Connection
Timeout
Timeout
Enter how long the Web Proxy keeps open a connection to a client or
server after a transaction has been completed. Keeping a connection open
allows the Web Proxy to use it again for another request.
server after a transaction has been completed. Keeping a connection open
allows the Web Proxy to use it again for another request.
For example, after a client finishes a transaction with google.com, the Web
Proxy keeps the connection to the server google.com open for the amount
of time specified in the server side persistent timeout if no other client
makes a request for google.com.
Proxy keeps the connection to the server google.com open for the amount
of time specified in the server side persistent timeout if no other client
makes a request for google.com.
•
Client side. The maximum number of seconds the Web Proxy keeps a
connection open with a client on the network with no activity from the
client.
connection open with a client on the network with no activity from the
client.
•
Server side. The maximum number of seconds the Web Proxy keeps
a connection open with a destination server with no activity from any
client on the network to that server.
a connection open with a destination server with no activity from any
client on the network to that server.
Default is 300 seconds for both client and server side persistent timeouts.
You might want to increase the server side persistent timeout if clients on
the network frequently connect to the same server, or if the network has a
relatively slow connection to outside servers.
the network frequently connect to the same server, or if the network has a
relatively slow connection to outside servers.
Cisco recommends keeping the default values. However, you might want
to increase or decrease these values to keep connections open longer to
reduce overhead used to open and close connections repeatedly. Consider
that if you increase the persistent timeout values, you also reduce the
ability of the Web Proxy to open new connections if the maximum number
of simultaneous persistent connections has been reached.
to increase or decrease these values to keep connections open longer to
reduce overhead used to open and close connections repeatedly. Consider
that if you increase the persistent timeout values, you also reduce the
ability of the Web Proxy to open new connections if the maximum number
of simultaneous persistent connections has been reached.
In-Use Connection
Timeout
Timeout
Enter how long the Web Proxy waits for more data from an idle client or
server when the current transaction has not been completed.
server when the current transaction has not been completed.
For example, if a client opens a connection and sends only half of the
request, the Web Proxy waits for the amount of time specified for the client
side reserve timeout for the rest of the request before closing the open
connection.
request, the Web Proxy waits for the amount of time specified for the client
side reserve timeout for the rest of the request before closing the open
connection.
•
Client side. The maximum number of seconds the Web Proxy keeps a
connection open with an idle client.
connection open with an idle client.
•
Server side. The maximum number of seconds the Web Proxy keeps
a connection open with an idle destination server.
a connection open with an idle destination server.
Default is 300 seconds for both client and server side reserve timeouts.
Simultaneous Persistent
Connections (Server
Maximum Number)
Connections (Server
Maximum Number)
Enter the maximum number of connections (sockets) the Web Proxy keeps
open with servers.
open with servers.
Table 5-1
Web Proxy Settings (continued)
Property
Description