以前我没有问题SSH进入Azure Ubuntu Linux，但现在当我尝试建立连接时，它只是挂起以下内容：
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 44.33.111.222 [40.80.140.222] port 2.
debug1: Connection established.
debug1: identity file azure_keys type 1
debug1: key_load_public: No such file or directory
debug1: identity file azure_keys-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
可能是什么问题？
修改
发现有如下日志：
# There is insufficient memory for the Java Runtime Environment to continue
# Native memory allocation (mmap) failed to map 262144 byes for committing reserved memory.
可能是内存不足正在停止SSH吗？