The Department of State Bureau of Consular Affairs is currently experiencing technical problems with its visa system. US visas are being issued, but at a reduced rate. This impact is worldwide and is not specific to any particular country, citizenship document, or visa category.
The problem emerged after the Bureau of Consular Affairs updated the software for the Oracle-based Consular Consolidated Database (CCD) on July 20. After that, the system went down until July 23, when its operations were partially restored. From the start of the operational issues on July 20 through July 28, US Embassies and Consulates issued approximately 220,000 nonimmigrant visas globally. Based on their average production figures, they should have issued closer to 425,000 nonimmigrant visas in that time period.
Some US Embassies and Consulates will temporarily limit or reschedule nonimmigrant visa interview appointments until more system resources become available to process these applications. Current expectation is it will take weeks to resume full visa processing capacity.
The problem is hitting travelers particularly hard during peak vacation season. Those who do not have a valid visa to return to the US with simply must have patience and wait until the situation is resolved.