When I insert this data in the column with type xml, I get an error "SSL SYSCALL error: EOF detected" and the gap of all current connections. When I insert a simpler xml, but larger everything is ok.
version: PostgreSQL 9.6.11 on x86_64-pc-linux-gnu (Ubuntu 9.6.11-1.pgdg16.04+1), compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609, 64-bit
(-bugs, +general)
Assuming the server is running remotely, maybe you should check link's MTU on the client? Or does the server backend crash when you run the query--did you check the server logs?