SEVERE: Unexpected exception: Read timed out
java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:152)
        at java.net.SocketInputStream.read(SocketInputStream.java:122)
        at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:756)
        at org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:786)
        at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:116)
        at org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:715)
        at org.apache.coyote.Request.doRead(Request.java:427)
        at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:304)
        at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:419)
        at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:327)
        at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:193)
        at org.apache.commons.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:999)
        at org.apache.commons.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:903)
        at java.io.FilterInputStream.read(FilterInputStream.java:133)
        at org.apache.commons.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:134)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
        at org.opendatakit.aggregate.parser.MultiPartFormData.<init>(MultiPartFormData.java:100)
        at org.opendatakit.aggregate.servlet.SubmissionServlet.doPost(SubmissionServlet.java:223)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.opendatakit.common.security.spring.SecurityContextHolderAwareAuthPreservingRequestFilter.doFilter(SecurityContextHolderAwareAuthPreservingRequestFilter.java:66)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.opendatakit.common.security.spring.DigestAuthenticationFilter.doFilter(DigestAuthenticationFilter.java:42)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
        at org.opendatakit.common.security.spring.OutOfBandUserFilter.doFilter(OutOfBandUserFilter.java:105)