huge Traffic Drop after upgrade

[khaled-jd]

Recently we changed the Firepower 4000 series and upgraded the FMC to 7.4.0 and FTD to 7.2.5.2

and all policies have been restored, we notice that huge traffic from different subnets is not allowed to continue

example: if we upload a huge file from vlan-x to vlan-y with port 4444 it's not completed 

note: no block observed in Event Connections

any experience with this problem

[balaji.bandi]

what was the before model ? and what code was running before ?

how did you moved the configuration from OLD to new, i would cross check the configuration again.

vlan-x to vlan-y with port 4444 it's not completed 

is this only issue you see after upgrading ?

is the VLAN x and VLAN y where do they Located in the same traffic zone ? and same Interface ? do the packet capture to see what is the error when the connection terminated.

[khaled-jd]

what was the before model: 4110 and the new one is 4112 (old FTD v is 6.4.0.9 and old FMC was 7.0.5)

is this only issue you see after upgrading ? yes

is the VLAN x and VLAN y where do they Located in the same traffic zone ? not in same zone

and same Interface ? not same inter face

do the packet capture to see what is the error when the connection terminated. --> I do it and check

[MHM Cisco World]

the FW rule either drop or not traffic not pass some and drop some 

look to the duplex and speed of link 

it can l1 issue 

MHM