# Gateway Stopped - JVM appears hung

**URL:** <https://forum.inductiveautomation.com/t/gateway-stopped-jvm-appears-hung/41632>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [December 17, 2020, 9:50pm UTC](https://forum.inductiveautomation.com/t/gateway-stopped-jvm-appears-hung/41632 "2020-12-17T21:50:25Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![epsmitas](https://avatars.discourse-cdn.com/v4/letter/e/4af34b/32.png) [@epsmitas](https://forum.inductiveautomation.com/u/epsmitas)\
**Post date:** [December 19, 2020, 8:40pm UTC](https://forum.inductiveautomation.com/t/gateway-stopped-jvm-appears-hung/41632/7 "2020-12-19T20:40:47Z")

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Follow up here in case anyone else runs across this problem.

JVM Hanging seems to be a resource based issue.

Kevin was on the right track suspecting Antivirus. But I was a little surprised that it turned out to be Microsoft Windows Defender. Since I have installed many gateways and never run into this issue. I typically leave Defender to “run out of the box”.

With Inductive support;

- We examined the Windows event logs at the time of one of the gateway crashes we could see that Windows Defender had been scheduled to run around the same time.
- Issuing a “Quick Scan” on Defender we were able to see the Gateway **“restarting”** multiple times. Defender appeared to get **“stuck”** on a file or location which froze the entire operating system ( i.e. File explorer would not navigate, Gateway web page was stuck ).

Further investigation

- I was able to issue an exception ( do not include in scan in Defender setup ) on a couple of Windows Folders ( system32 , SysWOW64 ) and make it through the quick scan without causing a gateway restart.
- I ran Defender Full scan and was able to cause the Gateway to **“crash”** despite those exceptions.
- Defender does not have a very verbose system of reporting it’s execution. So it is hard to pinpoint the file or issue.

For further clarity on how the JVM wrapper operates on Java freezing see;

[https://wrapper.tanukisoftware.com/doc/english/qna-freeze.html](https://wrapper.tanukisoftware.com/doc/english/qna-freeze.html)  
[https://wrapper.tanukisoftware.com/doc/english/prop-jvm-terminate-timeout.html](https://wrapper.tanukisoftware.com/doc/english/prop-jvm-terminate-timeout.html)

**Excerpt**

- _The Java Service Wrapper [periodically pings the JVM process (every 5 seconds by default)](https://wrapper.tanukisoftware.com/doc/english/prop-ping-interval.html) and waits for a response. If the response fails to arrive [within a configured period of time (30 seconds by default)](https://wrapper.tanukisoftware.com/doc/english/prop-ping-timeout.html), then the Wrapper will determine that it is frozen. The Wrapper also takes into account things like overall system load to make sure that false positives are kept to a minimum._

Not sure if these are the defaults with Ignition…  
wrapper.ping.timeout=30  
wrapper.ping.interval=5  
wrapper.jvm\_terminate.timeout=10

At this point in time I have no choice but to disable Windows Defender. I have temporaily installed Kaspersky, done a full scan which resulted in no viruses and the gateway ticking along no problem during a full scan.

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