# External Passive FTP Health Monitor

**URL:** <https://community.f5.com/t/external-passive-ftp-health-monitor/5664>\
**Category:** Technical Forums\
**Tags:** ftp, ltm, application-delivery\
**Created:** [April 12, 2018, 5:42pm UTC](https://community.f5.com/t/external-passive-ftp-health-monitor/5664 "2018-04-12T17:42:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Adilkhan\_174866](https://avatars.discourse-cdn.com/v4/letter/a/4491bb/32.png) [@Adilkhan\_174866](https://community.f5.com/u/Adilkhan_174866)\
**Post date:** [April 12, 2018, 5:42pm UTC](https://community.f5.com/t/external-passive-ftp-health-monitor/5664/1 "2018-04-12T17:42:37Z")

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Hi Guys,

I need help In writing a scripted FTP Health Monitor, due to the Upgrade of our F5 from 11.53. to 12.1.2, there are some changes In The way a standard FTP Works, It now request a ‘File Size’, (The BIG-IP system requests binary mode and the file size\_ ref: [https://support.f5.com/csp/article/K11481312](https://support.f5.com/csp/article/K11481312))

The proxies, which have the FTP Server within, are now generating an error and cant be changed “Response sent to user keepalive: 502 Command SIZE not implemented”

I need to create an EAV Health Monitor which simulate the same as before but without the FTP File size option: