The following tool has been running without problem for years:

Recently the tool has started generating the following error message:

Can't call method "findnodes" on an undefined value at /data/project/citation-template-filling/perl/ActivePerl-5.26/site/lib/WWW/Search/ line 117. in turn makes a request to  “'” for data.  For debugging, I queried the entrez server using an equivalent command in curl which generated the following error messages:

curl ''

curl: (6) Could not resolve host:

I also tried replacing with its IP address:

curl ''

curl: (51) SSL: no alternative certificate subject name matches target host name ''

The same curl command runs without problem on my local workstation:

curl '

<!DOCTYPE PubmedArticleSet PUBLIC "-//NLM//DTD PubMedArticle, 1st January 2019//EN" ""> …

Anyone have an idea how to fix this?  Thanks,