Bitsreams not loading in Dspace 7, AJP error?

[Tyler Mobley]

I'm running DSpace 7 and have just been alerted that for some reason bitstreams aren't loading. The bistreams are all PDFs, and this DID used to work, but now clicking a bitstream link is resulting in a long wait followed by a 503 from Apache httpd. I have the backend set up with an AJP reverse proxy to Apache as per install instructions. Everything else seems to be running OK. I see no issues in dspace logs, but I do get the following in Apache's error log:

[Mon Jan 24 12:51:16.844986 2022] [proxy_ajp:error] [pid 1166:tid 140646371268352] (70007)The timeout specified has expired: AH01030: ajp_ilink_receive() can't receive header
[Mon Jan 24 12:51:16.845050 2022] [proxy_ajp:error] [pid 1166:tid 140646371268352] [client 10.169.2.41:52852] AH00992: ajp_read_header: ajp_ilink_receive failed, referer: https://api-d.library.cofc.edu/server/
[Mon Jan 24 12:51:16.845075 2022] [proxy_ajp:error] [pid 1166:tid 140646371268352] (70007)The timeout specified has expired: [client 10.169.2.41:52852] AH00878: read response failed from [::1]:8009 (localhost), referer: https://api-d.library.cofc.edu/server/

Anyone seen this before? The only changes I've made semi-recently were issuing new SSL certs to the box. One cert covering both frontend and backend domains. Maybe that's causing some confusion?

Thanks,

Tyler

[Tyler Mobley]

For whatever reason, a backend upgrade to 7.1.1 resolved this.