ZBX_TCP_WRITE() failed [Connection timed out]

[low10sws6]

Get This Error in the PROXY log file after not seeing any updated in the latest data.

Error while sending data to the server [ZBX_TCP_WRITE() failed [Connection timed out


Happens every 12-15mins about

This only happening at one location/customer all other Proxies are working correctly

is this a problem with the proxy or network or something else????
this used to work but stopped at some point

Please help

[low10sws6]

Resolved

MTU size on firewall was set at 1400

proxy was sending a 1438 byte packet

changed MTU size to 1500 on inside and outside

Server flood with data!