Hi,we're experiencing problem with Tomcat 7.0.92 with NIO connector which results in randomly resetting connections by server (client receives ERR_CONNECTION_RESET). The problem doesn't occur with BIO connector but we need NIO to support Comet-based servlet.
Observations:1) In TCP dump we see that server sends (RST, ACK) just after receiving GET request. 2) Thousands of EOFExceptions with message "Unexpected EOF read on the socket" are recorded in JFR through 15 minutes. They come from InternalNioInputBuffer.readSocket(). 3) In result of "netstat -s" we see that parameter "connections reset due to early user close" grows quickly. 4) Number of reset connections grow when server is under higher load but the problem is still present when a load is much smaller.
Server is a virtual machine and runs on RHEL 6.10. Connections come through LB (F5) and firewall (Palo Alto 3050).
Connector configuration:
<Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
connectionTimeout="20000"
redirectPort="8443"
acceptorThreadCount="1"
minSpareThreads="40"
maxThreads="400"
secure="true"
relaxedQueryChars='^{}[]|"' />
Do you have any idea what could cause such a behaviour?
--
Jan Tarnowski
Comarch S.A.
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