Errors related to connection issues internet proxy

I have aggregate_bismark_output_grch38 method configuration in aryee-merkin/dna-methylation-pipeline-paper workspace. It uses some bioconductor packages to access annotation information from their server. In the past few weeks I am experiencing this issue with large number of samples. Following is the error message that leads to failure URL 'http://bioconductor.org/BiocInstaller.dcf': status was 'Couldn't resolve host name'. Based on biostar forum (https://support.bioconductor.org/p/104731/) it seems like a problem related to network connection. I have been experiencing this issue in the past few weeks and it was working fine before also I only see this error for large sample sets. I am not sure whether this is something related to FireCloud or something else. So I just want to see of it is something related to network connection issues in FireCloud.