SFTP 连接超时

如何解决SFTP 连接超时

使用 pysftp 包（paramiko SSH 客户端的包装器），我在建立连接时遇到超时。这大约在 80% 的时间内有效，但在另外 20% 的时间内失败（每天运行，每周失败 1-2 次）。 pysftp 版本是 0.2.9，在 RHEL 7.7 上运行。连接位于公司网络内（无防火墙或代理）。

            connection_options = pysftp.CnOpts()
            if args.debug:
                connection_options.log = True
            sftp = pysftp.Connection(host = 'server_name',username='xxxxx',private_key = file_name,private_key_pass = 'passphrase',cnopts=connection_options)

调试日志（最后两行显示超时）：

2021-06-25 20:00:07,918:DEBUG:transport.py:33388:_log:1819:starting thread (client mode): 0xfcc96550
2021-06-25 20:00:07,919:DEBUG:transport.py:33388:_log:1819:Local version/idstring: SSH-2.0-paramiko_2.7.2
2021-06-25 20:00:07,992:DEBUG:transport.py:33388:_log:1819:Remote version/idstring: SSH-2.0-WRQReflectionforSecureIT_8.1 Build 94
2021-06-25 20:00:07,992:INFO:transport.py:33388:_log:1819:Connected (version 2.0,client WRQReflectionforSecureIT_8.1)
2021-06-25 20:00:08,000:DEBUG:transport.py:33388:_log:1819:kex algos:['diffie-hellman-group1-sha1','diffie-hellman-group14-sha1','diffie-hellman-group-exchange-sha1','diffie-hellman-group-exchange-sha256','gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==','gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g=='] server key:['ssh-rsa-sha2-256@attachmate.com','ssh-rsa'] client encrypt:['aes128-ctr','aes192-ctr','aes256-ctr','aes128-cbc','aes192-cbc','aes256-cbc','3des-cbc','blowfish-cbc','cast128-cbc','arcfour256','arcfour128','arcfour'] server encrypt:['aes128-ctr','arcfour'] client mac:['hmac-sha256','hmac-sha2-256','hmac-sha1','hmac-md5','hmac-sha1-96','hmac-md5-96','hmac-ripemd160','hmac-sha512','hmac-sha2-512'] server mac:['hmac-sha256','hmac-sha2-512'] client compress:['zlib','none'] server compress:['zlib','none'] client lang:[''] server lang:[''] kex follows?False
2021-06-25 20:00:08,000:DEBUG:transport.py:33388:_log:1819:Kex agreed: diffie-hellman-group-exchange-sha256
2021-06-25 20:00:08,000:DEBUG:transport.py:33388:_log:1819:HostKey agreed: ssh-rsa
2021-06-25 20:00:08,001:DEBUG:transport.py:33388:_log:1819:Cipher agreed: aes128-ctr
2021-06-25 20:00:08,001:DEBUG:transport.py:33388:_log:1819:MAC agreed: hmac-sha2-256
2021-06-25 20:00:08,001:DEBUG:transport.py:33388:_log:1819:Compression agreed: none
2021-06-25 20:00:08,365:DEBUG:transport.py:33388:_log:1819:Got server p (2048 bits)
2021-06-25 20:00:08,538:DEBUG:transport.py:33388:_log:1819:kex engine KexGexSHA256 specified hash_algo <built-in function openssl_sha256>
2021-06-25 20:00:08,539:DEBUG:transport.py:33388:_log:1819:Switch to new keys ...
2021-06-25 20:00:08,539:DEBUG:transport.py:33388:_log:1819:Host key verified (ssh-rsa)
2021-06-25 20:00:08,540:DEBUG:transport.py:33388:_log:1819:Attempting public-key auth...
2021-06-25 20:00:08,908:DEBUG:transport.py:33388:_log:1819:userauth is OK
2021-06-25 20:00:38,585:ERROR:mylogins_extract.py:33388:mylogins_extract:180:Authentication timeout.

如何解决SFTP 连接超时

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