![]() ![]() ![]() The peer end does not receive the FIN packet, and therefore will not return the ACK packet. The FIN packet is not sent out of the network card of the virtual machine. This also reversely proves it reasonable that no FIN packet is captured from the network card. Another piece of information about the socket is that the socket is in the TIME_WAIT_1 state for a long time. If the socket is in the TIME_WAIT_1 state, it proves that the system call is normal.Īccording to the TCP state machine, the socket enters the TIME_WAIT_1 state after sending the FIN and enters the TIME_WAIT_2 state after receiving the ACK packet from the peer end. At this point, a relatively simple and effective method is to check the status of the socket. However, it is not clear whether the problem is caused by the system call or occurs after the FIN is constructed. ![]() The above description implies that the problem lies in the kernel-mode between the user space and the network card driver. The key information in this regard is as follows:Ģ) No FIN packet is captured from the network card of the ECS instance. Therefore, the preceding symptom is abnormal. Usually, after the process is killed, close() command is called in user mode to initiate a TCP FIN to the peer end. The following sections comprehensively analyze the reasons behind this problem. ![]() As a result, the connection on the server is not properly closed. However, once the process is killed, it is observed that the tcpdump cannot capture any FIN packet. SymptomsĪ process on the ECS instance establishes a socket connection to another server. Furthermore, the article also illustrates the new packet processing logic of the conntrack-related code after a conntrack entry times out. In such a scenario, the TCP connection doesn't properly close due to the setting of conntrack kernel parameters and iptables rules. Check this connector's authentication setting.This article describes a TCP connection case where the socket is always in the FIN_WAIT_1 state. Receive connector 10.0.0.5:25 requires Transport Layer Security (TLS) before the MailFrom command can be run, but the server can't achieve it. The source IP address of the server that tried to authenticate to Microsoft Exchange is. Inbound direct trust authentication failed for certificate %1. The event log seems to indicate that its due to a tcp/ip socket error (see below).Ĭan anyone suggest how to troubleshoot this further? We are migrating from 2010 to exchange 2013 (now sp1) but have a problem with the transport service crashing. ![]()
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