Cannot access page groups via Navigator "portlet could not be contacted"

On the Portal Navigator's Page Groups tab, the error "The portlet could not be contacted." appears where the list of Page Groups should be.
This is happening for 2 users. I see it the error in 1 browser, but not in another (logged on in both browser as same user).
There are no errors in the Apache error log. There are errors in the OC4J_Portal application log:
07/01/26 14:32:05 portal: id=673911615591,2 ContentFetcher Unexpected Exception Request Failed:oracle.webdb.dispatcher.DispatcherException: I/O Error dispatching request name=content-fetcher0 label=dbPortlet url=http://portal.domain.com:7823/pls/portal/!PORTAL.wwpro_app_provider.execute_portlet/771029724/15 time=949ms timeout=15000ms process=Redirecting
07/01/26 14:32:05 portal: [perf] 199.64.107.21 http://portal.domain.com:7823/pls/portal/!PORTAL.wwpro_app_provider.execute_portlet/771029724/15 id=673911615591,2 type=dbPortlet name=ORACLE+PORTAL,6_500169_6_3_23 status=(null) user=E032034 subscriberID=1 reqTime=949ms waitTime=0ms cache=(null) timeout=No redirects=0 bytes=0 authLevel=10 webCacheStatus=(null) webCacheExpires=(null) webCacheAge=(null) csConv=No readTime=No,0ms pageTimeout=No procTime=0ms
07/01/26 14:32:05 portal: [perf] 199.64.107.21 http://portal.domain.com:7823/pls/portal/!PORTAL.wwpob_page.show?_pageid=6,3,6_23 id=673911615591,2 type=pageMeta name=6,3,6_23 status=200 user=E032034 subscriberID=1 reqTime=90ms waitTime=0ms cache=MISS,NEW timeout=No redirects=0 bytes=19652 authLevel=10 webCacheStatus=MISS,STALE [G] webCacheExpires=86400 webCacheAge=0 csConv=No readTime=No,0ms pageTimeout=No procTime=90ms
07/01/26 14:32:05 portal: [perf] 199.64.107.21 http://portal.domain.com/portal/page?_pageid=6,3,6_23&_dad=portal&_schema=PORTAL id=673911615591,2 type=page name=6,3,6_23 status=200 user=E032034 subscriberID=1 reqTime=1039ms waitTime=0ms cache=(null) timeout=No redirects=0 bytes=16878 authLevel=10 webCacheStatus=(null) webCacheExpires=(null) webCacheAge=(null) csConv=No readTime=No,0ms pageTimeout=No procTime=0ms
I placed the log in debug mode and got the error below:
07/01/26 18:54:20 portal: DEBUG: active=26 id=8817185720131,2 Content Fetcher Caught Dispatcher Exception :
oracle.webdb.utils.PortalExceptionImpl: I/O Error dispatching request
     at oracle.portal.PortalException.<init>(Unknown Source)
     at oracle.webdb.dispatcher.DispatcherException.<init>(Unknown Source)
     at oracle.webdb.dispatcher.HTTPDispatcher.dispatch(Unknown Source)
     at oracle.webdb.dispatcher.CacheDispatcher.dispatch(Unknown Source)
     at oracle.webdb.page.ContentFetcher.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused: connect
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
     at java.net.Socket.connect(Socket.java:452)
     at java.net.Socket.connect(Socket.java:402)
     at java.net.Socket.<init>(Socket.java:309)
     at java.net.Socket.<init>(Socket.java:153)
     at HTTPClient.HTTPConnection$EstablishConnection.run(HTTPConnection.java:3938)
caused by: java.net.ConnectException: Connection refused: connect
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
     at java.net.Socket.connect(Socket.java:452)
     at java.net.Socket.connect(Socket.java:402)
     at java.net.Socket.<init>(Socket.java:309)
     at java.net.Socket.<init>(Socket.java:153)
     at HTTPClient.HTTPConnection$EstablishConnection.run(HTTPConnection.java:3938)
What is confusing is how 1 browser gets the error but another does not.
Any suggestions?
TIA

This issue seems to be related to the specific URL used to access the Navigator. I was using a specific URL to display a particular page region for editing, namely
/portal/page?_pageid=6,3,6_23&_dad=portal&_schema=PORTAL&p_otype=FOLDER&p_octx=FOLDER.334478_1453&p_domain=wwc&p_sub_domain=SITEEXP
Once the Navigator is accessed via this URL, all subsequent attempts to access Page Groups Navigator portlet fail.
I changed my process to not use the URL above.

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