10-01-2009, 02:58
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חבר מתאריך: 11.02.04
הודעות: 16,543
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הוזי, נו טוב כל יום לומדים משהו חדש...
ציטוט:
I,ve copied the post info from there so you can read it..
Problem with sending/receiving email and certain web pages will not load.
Products:
Sygate® Personal Firewall
Sygate® Personal Firewall Pro
Operating systems:
All supported operating systems.
Details:
Mail clients for POP3/SMTP fail and certain web pages fail to load; mostly noticed with but not limited to secure web logon web pages. If setting SPF to Allow All the web pages begin to load and mail is being sent, then this Advanced Rule should correct your problem.
You probably have a DSL broadband connection that is using a DSL/NAT device or home router. DSL uses a lower MTU value than the default value of 1500 assigned by Microsoft for your network card. The best value can vary per user but for most people the MTU value of 1492 is the highest value that can be set and works for most users. When your MTU value is set higher than what is being allowed by the DSL/NAT modem an ICMP packet Type 3 is sent back to your PC telling your PC the packet that was just sent is too big, make it smaller and send it again. SPF will block this request so you must create the Advanced Rule. Now once Type 3 is allowed the Type 4 should be accepted back but just in case we set the rule to accept both ICMP type 3 and 4.
Step-by-Step:
TOOLS -> ADVANCED RULES -> ADD -> configure below:
- General Tab
---- Rule Description: Allow ICMP Type 3,4
---- Action: Allow this traffic
---- Advanced Settings: All network interface cards
---- Screensaver Mode: Both on and off
---- Record this traffic in "Packet Log" [OPTIONAL]
-Hosts Tab
---- Remote Host: All addresses
- Ports and Protocols Tab
---- Protocol: ICMP
---- Select:
------- Destination Unreachable - 3
------- Source Quench - 4
---- Traffic Direction: Both
- Scheduling Tab
---- Enable Scheduling: UNCHECKED
- Applications Tab
---- [NOT NEEDED]
Keywords:
DSL, POP3, SMTP, SSL, EMAIL, OUTLOOK, MTU, ICMP-NTOSKRNL, MS PASSPORT, WINDOWS UPDATE, FTP, SFTP, FAIL LOGON, WEB MAIL
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