Dear Mark,
       I have seen all the logs but the cause of the problem is not 
clear.
The system now give this error:
Service Unavailable

The server is temporarily unable to service your request due to maintenance 
downtime or capacity problems. Please try again later.


This is the cocoon.log

2019-07-29 09:09:41,843 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for 
PK_G-aspect-cocoon://DRI/9/handle/10556/2949?pipelinehash=4400125204872469117_T-Navigation-2179865478699912566_T-ItemViewer-983520235286152229
2019-07-29 09:09:43,523 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache HIT for 
PK_G-aspect-cocoon://DRI/8/handle/10556/2949?pipelinehash=-4626015561481666846_T-Navigation-5728138339744327642
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache HIT for 
PK_G-aspect-cocoon://DRI/7/handle/10556/2949?pipelinehash=4118340052035854956_T-Navigation-5728138339744327642
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for 
PK_G-aspect-cocoon://DRI/6/handle/10556/2949_T-SystemwideAlerts-1_T-Navigation--5367372201529954577
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for 
PK_G-aspect-cocoon://DRI/5/handle/10556/2949_T-Navigation--5255526706584267476
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for PK_G-aspect-cocoon://DRI/4/handle/10556/2949
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for PK_G-aspect-cocoon://DRI/3/handle/10556/2949
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for PK_G-aspect-cocoon://DRI/2/handle/10556/2949
2019-07-29 09:09:43,525 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for PK_G-aspect-cocoon://DRI/1/handle/10556/2949
2019-07-29 09:09:43,528 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for 
PK_G-file-cocoon://DRI/handle/10556/2949_T-xslt-file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/themes/Mirage2/xsl/preprocess.xsl_T-IncludePageMeta--2183294294163301955_T-xslt-file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/themes/Mirage2/xsl/theme.xsl_T-i18n-context://i18n/?it___T-strip-namespaces-1_S-html-no-doctype-;encoding=UTF-8;indent=yes
2019-07-29 09:09:43,714 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache HIT for 
PK_R-ThemeResourceReader-file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/themes/Mirage2/scripts-dist.xml
2019-07-29 09:09:43,716 WARN  cocoon.access  - 
org.apache.catalina.connector.ClientAbortException: java.io.IOException: 
Broken pipe
2019-07-29 09:09:43,716 INFO  cocoon.access  - 'handle/10556/2949' 
Processed by Apache Cocoon in 2.7382834 minutes.
2019-07-29 09:09:45,528 INFO  cocoon.access  - 
'bitstream/handle/10556/1015/tesi A. Marandino.pdf' Processed by Apache 
Cocoon in 239 milliseconds.
2019-07-29 09:09:54,217 INFO  
org.apache.cocoon.components.treeprocessor.sitemap.RedirectToURINode  - 
Redirecting to '/bitstream/handle/10556/1014/abstract in italiano e inglese 
D. Marra.pdf?sequence=2' at <map:redirect-to> - 
file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/sitemap.xmap:369:137
2019-07-29 09:09:54,218 INFO  
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor$TreeProcessorRedirector
  
- Redirecting to '/bitstream/handle/10556/1014/abstract in italiano e 
inglese D. Marra.pdf?sequence=2'
2019-07-29 09:09:54,218 INFO  cocoon.access  - 
'bitstream/10556/1014/2/abstract in italiano e inglese D. Marra.pdf' 
Processed by Apache Cocoon in 1 milliseconds.
2019-07-29 09:10:16,829 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache HIT for 
PK_G-file-file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/aspects/protodocument.xml
2019-07-29 09:10:16,830 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache MISS for 
PK_G-aspect-cocoon://DRI/9/handle/10556/974?pipelinehash=4400125204872469117_T-Navigation--3826449426891179088_T-ItemViewer-4920697739924254990

2019-07-29 09:10:16,979 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Caching new response for 
PK_G-aspect-cocoon://DRI/8/handle/10556/974?pipelinehash=726219467082772024_T-Navigation--7644061660383790846
2019-07-29 09:10:16,980 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Caching new response for 
PK_G-aspect-cocoon://DRI/7/handle/10556/974?pipelinehash=-7886039018503951890_T-Navigation--7644061660383790846
2019-07-29 09:10:16,988 INFO  cocoon.access  - 'handle/10556/974' Processed 
by Apache Cocoon in 187 milliseconds.
2019-07-29 09:10:38,391 INFO  org.apache.cocoon.caching.impl.CacheImpl  - 
Cache HIT for 
PK_R-ThemeResourceReader-file:///usr/local/src/apache-tomcat-9.0.20/webapps/xmlui/themes/Mirage2/scripts-dist.xml
2019-07-29 09:10:38,394 WARN  cocoon.access  - 
org.apache.catalina.connector.ClientAbortException: java.io.IOException: 
Broken pipe
2019-07-29 09:10:38,394 INFO  cocoon.access  - 'handle/10556/2949' 
Processed by Apache Cocoon in 2.8829834 minutes.

This the dspace.log


2019-07-29 09:27:50,178 INFO  org.dspace.statistics.SolrLoggerServiceImpl @ 
Failed DNS Lookup for IP:172.16.7.4
2019-07-29 09:27:50,178 ERROR org.dspace.statistics.SolrLoggerServiceImpl @ 
Unable to get location of request:  The address 172.16.7.4 is not in the 
database.


This error happen only on the xmlui (mirage2 theme) if i try to see the 
same item on the jspui there is no problem.
Do you have some suggestions?
Thanks
Best regards
Massimiliano




> If you see this message, and you *are* the server administrator, then 
> the first thing to do (as hinted in the last line) is to inspect the 
> logs around the time of the error.  If the cause of the problem is not 
> clear from the logs, please post the relevant portions here.  It is 
> better to provide too much context, than too little. 
>
> -- 
> Mark H. Wood 
> Lead Technology Analyst 
>
> University Library 
> Indiana University - Purdue University Indianapolis 
> 755 W. Michigan Street 
> Indianapolis, IN 46202 
> 317-274-0749 
> www.ulib.iupui.edu 
>

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