One important note is that not all sessions showing end-reason of "threat" will be logged in the threat logs. Use Syslog for Monitoring. Any traffic that uses UDP or ICMP is seen will have session end reason as aged-out in the traffic log. What does the TCP FINs mean at the end and why is there a FIN Timeout at the end. Check for any routing loops. Environment All platforms including VM firewalls Firewalls running on PAN-OS 9.1.13 or 10.0.10 (not affected to other PAN-OS versions) Cause In Palo Alto, we can check as below: Discard TCP Maximum length of time that a TCP session remains open after it is denied based on a security policy configured on the firewall. 67832. The session end reason will also be exportable through all means available on the Palo Alto Networks firewall. Default: 90. Flow Basic 1 Set a filter to control what traffic is logged. 4 LoHungTheSilent 2 yr. ago Here is my WAG, ignoring any issues server side which should probably be checked first. We can then see the different drop types (such as flow_policy_deny for packets that were dropped by a security rule), and see how many packets were dropped. PA is 850. ctive passive version 9.1.6 Predict - This type is applied to sessions that are created when Layer7 Application Layer Gateway (ALG) is required. Answer The reason for TCP-REUSE is that session is reused and the firewall closes the previous session. You can define a number of timeouts for TCP, UDP, and ICMP sessions in particular. Aged out - Occurs when a session closes due to aging out. Palo Alto firewall checks whether a certificate is valid X.509 v1, v2 or a v3 certificate. The client (139.96.216.21) starting the TCP session to the destination (121.42.244.12). TCP-reuse involves the following: A TCP Time wait timer is triggered [15 seconds] when the firewall receives the second FIN [gracious TCP termination] or an RST, which ideally means that the session is good for closing in 15 seconds. The new list of session end reasons, according to their precedence. "The issue is due to a current limitation in identifying session end reasons with SSL code values, which is expected to be fixed in the upcoming maintenance releases (ETA unknown). For session end reason you don't have to do anything on PA (unless it's actually denied by PA). . After upgrading PAN-OS to 9.1.13 or 10.0.10, unexpected traffic failure may occurs and traffic log shows the session end reason "resources-unavailable". Now depending on the type like TCP-RST-FROM-CLIENT or TCP-RST-FROM-SERVER, it tells you who is sending TCP reset and session gets terminated. Later on I searched on my Palo Alto lab unit for sessions with ( subtype neq end ) and ( action eq allow ), i.e., denied connections that have an action of allow as well. PAN-OS Administrator's Guide. Created On 03/22/19 05:56 AM - Last Modified 04/01/19 09:11 AM. tcp-reset-from-server means your server tearing down the session. Rule allowing http and https traffic Traffic log 1 person had this problem. TCP reset can be caused by several reasons. HTTP, Telnet, SSH). Any idea why it is So? Look for any issue at the server end. Range: 1-15,999,999. . n/aThis value applies when the traffic log type is not end. Certificate Profile Decryption Policy SSL Forward Proxy Decryption . As of now, the session-end-reason is working as designed and uses the generic "policy-deny" for certain failure condition." It is something that is to be expected for services using the UDP protocol. Monitoring. Packet captures will help. This is because unlike TCP, there is there is no way for a graceful termination of UDP session and so aged-out is a legitimate session-end reason for UDP (and ICMP) sessions. What that means..anyone's guess. Logs can be written to the data lake by many different appliances and applications. Please have a look at attachement. And reset (either by server or client) is a normal ending of TCP session. - Noticed that there were several tcp-fin, aged-out, or tcp-rst-from-server reasons for a session end; > All of these coincide with the Dell-Allow-Command-Update rule; > It is possible that applying the file policy to this rule will also help alleviate the issue; > Committed the changes that were made so we can test this; After upgrading PAN-OS to 9.1.13 or 10.0.10, unexpected traffic failure may occurs and traffic log shows the session end reason "resources-unavailable". Indeed I found some with "session end reason" of either "decrypt-unsupport-param" or "decrypt-error". 4 Turn off Debugging. Basically, it doesn't trust either the certificate from the site or the intermediate CA (usually the latter), even though it may trust the root CA. end-reason ==> The reason because the session has been closed, could be aged-out, policy-deny, tcp messages (fin, rst), threat . Hi, I'm troubleshooting a connection problem between a client (inside) and a server (outside). Anyway, as I work on fine-tuning the policies to allow applications through, I have been getting errors for specific websites and applications with a session end reason of "decrypt-cert-validation". After one month, one site is blocked, and in the Monitor-logs for that site I get: session end reason decrypt-error My, trust and untrust cert are SS (generated on PA). TCP reset sent by firewall could happen due to multiple reasons such as: Configuration of access control lists (ACLs) where action is set to 'DENY' When a threat is detected on the network traffic flow Usually firewall has smaller session TTL than client PC for idle connection. action allow but type deny auth-policy-redirect 5 Aggregate the logs (PA-5000 Series) 6 View the debug log (tail or less) What is asymmetric routing Palo Alto? Environment All platforms including VM firewalls Firewalls running on PAN-OS 9.1.13 (includes h1 and h3) or 10.0.10 (does not include h1) Other PAN-OS versions are NOT affected by this issue Cause On Palo Alto Networks firewalls there are two types of sessions: Flow - Regular type of session where the flow is the same between c2s and s2c (ex. @Jimmy20, Normally these are the session end reasons. When monitoring the traffic logs using Monitor > logs > Traffic, some traffic is seen with the Session End Reason as aged-out. Session end reason: decrypt-cert-validation. If one of the Threat Prevention features detects a threat and enacts a block, this will result in a traffic log entry with an action of allow (because it was allowed by policy) and session-end-reason: threat (because a Threat Prevention feature blocked the traffic after it was initially allowed and a threat was identified). The first was Palo Alto's 8.0 and 8.1 documentation on the "decrypt-error" session reason end saying: "The session terminated because you configured the firewall to block SSL forward proxy decryption or SSL inbound inspection when firewall resources or the hardware security module (HSM) were unavailable. 3 Conduct Testing. Session End Reason auth-policy-redirect Go to solution Bijesh L1 Bithead Options 07-10-2020 11:30 AM Allowed all http and https traffic to Untrust, still the traffic on port 80 is getting blocked. 2 Enable debug logging. Traffic Log Fields. A session timeout defines the duration of time for which PAN-OS maintains a session on the firewall after inactivity in the session. threat policy-deny SSL session end reason information will be visible and usable in traffic log queries through all available interfaces. Well, this at least gives some information about the root . Document: Explore Schema Reference Session End Reason Previous Next You can query for log records stored in Palo Alto Networks Cortex Data Lake. Session time out is also a normal occurence for non TCP sessions. New additions are in bold. By default, when the session timeout for the protocol expires, PAN-OS closes the session. My guess - looks like the session ended for a reason PA doesn't know how to 'classify'. The Palo Alto firewall will keep a count of all drops and what causes them, which we can access with show counter global filter severity drop. How do I take my basic flow in Palo Alto? session end reason decrypt-error I have a test machine to test decryption policy before large scale depl. Any traffic that uses UDP or ICMP is seen will have session end reason as aged-out in the traffic log. Syslog Field Descriptions. So no action is needed there, these are just helpful info PA provides. What does TCP aged out mean? It does not mean that firewall is blocking the traffic. In these discussions, the different users were all looking for some clarification on the session end reason "aged-out." This type of end reason could actually be perfectly normal behavior depending on the type of traffic. As the content-ID engine blocked the session before the session timed-out, the block-URL action log entry will show a receive time of earlier than the firewall log entry with the "allow" action. This book describes the logs and log fields that Explore allows you to retrieve. Basically means there wasn't a normal reset, fin or other types of close connections packets for tcp seen.
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