https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152976#M25606 <P>According to sk113479, what is happening is the connection is terminated (either by the client or server) prior to the firewall being able to do a deep layer (application/URL Filtering/data/etc.) inspection. Basically the firewall has allowed the original connection based on OSI layers 1-4 because it is still has not passed data in layers 4-7 to determine the actual application/URL/Data/etc. in use by the connection. Since the packet was dropped prior to having this information, the firewall has not come up with a final match within the rule base. Without this final match, the connection would not create a log, so to make sure the connection is logged, the firewall uses this log to let you know the connection was attempted, but there was not enough information to reach a final match and determine if the connection should have been allowed or dropped.&nbsp;</P><P>Watch the video in the sk - it goes into more depth about this. Wait for the final example - that is where this is explained in better detail.&nbsp;</P> Thu, 14 Jul 2022 12:57:12 GMT Chris_Hoff 2022-07-14T12:57:12Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152957#M25589 <P>there is an error on some logs "<SPAN>Connection terminated before detection: Insufficient data passed.</SPAN><BR /><SPAN>To learn more see sk113479."&nbsp;in this regard, there is no access to the personal account on one of the sites</SPAN></P> Thu, 14 Jul 2022 10:16:30 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152957#M25589 Arturxr 2022-07-14T10:16:30Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152963#M25594 <P>Did you review&nbsp;<SPAN>sk113479 does it not apply to your case?</SPAN></P> Thu, 14 Jul 2022 11:25:47 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152963#M25594 Chris_Atkinson 2022-07-14T11:25:47Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152964#M25595 <P>I looked at this ck but did not find any suitable solution to the problem there</P> Thu, 14 Jul 2022 11:34:39 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152964#M25595 Arturxr 2022-07-14T11:34:39Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152976#M25606 <P>According to sk113479, what is happening is the connection is terminated (either by the client or server) prior to the firewall being able to do a deep layer (application/URL Filtering/data/etc.) inspection. Basically the firewall has allowed the original connection based on OSI layers 1-4 because it is still has not passed data in layers 4-7 to determine the actual application/URL/Data/etc. in use by the connection. Since the packet was dropped prior to having this information, the firewall has not come up with a final match within the rule base. Without this final match, the connection would not create a log, so to make sure the connection is logged, the firewall uses this log to let you know the connection was attempted, but there was not enough information to reach a final match and determine if the connection should have been allowed or dropped.&nbsp;</P><P>Watch the video in the sk - it goes into more depth about this. Wait for the final example - that is where this is explained in better detail.&nbsp;</P> Thu, 14 Jul 2022 12:57:12 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/Connection-terminated-before-detection-Insufficient-data-passed/m-p/152976#M25606 Chris_Hoff 2022-07-14T12:57:12Z